Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) AADT event polyline feature class represents the average number of vehicles traveling on roadway segments per day, averaged over each calendar year. This data is collected via permanent traffic counters, short-term studies, and statistical estimation methods on Idaho’s state highways and select local roads.The Annual Average Daily Traffic (AADT) dataset is foundational for transportation planning, roadway design, traffic safety analysis, infrastructure funding, and environmental assessments. It is used by engineers, planners, agencies, and researchers to prioritize maintenance, design new infrastructure, and analyze long-term traffic trends and patterns. The dataset provides a comprehensive historical record of traffic volumes across Idaho’s transportation network. Users should note that data collection methodologies and technologies may have evolved over time.
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) bridges event point feature class represents the current and historic bridge locations across Idaho. Bridge data is used for infrastructure monitoring, asset management, and statewide transportation planning.
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) city limits event polyline feature class is a linear representation of the city limits polygon layer. This layer is used within external applications that summarize data based on city limit boundaries but cannot utilize a polygon geometry, therefore utilize the linear features.
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) county limits event polyline feature class is a linear representation of the counties polygon layer. This layer is used within external applications that summarize data based on county boundaries but cannot utilize and polygon geometry, therefore utilize the linear features.
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) designated routes 129k event polyline feature class' purpose is to provide the designated and approved 129k routes for industry to know where they can carry 129,000 pound loads with an annual permit. The route code colors field corresponds to the Extra Length / Excess Weight up to 129,000 Pounds Map that is published by the ITD Department of Motor Vehicles Commercial Vehicle Services Group.
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) district limits event polyline feature class is a linear representation of the ITD districts polygon layer. This layer is used within external applications that summarize data based on district boundaries but cannot utilize a polygon geometry, therefore utilize the the linear features.
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) extra length combination routes event polyline feature class' purpose is to provide industry with the legal route designations for commercial vehicle combinations. The extra length combination code (colors) field corresponds to the Extra Length / Excess Weight up to 129,000 Pounds Map that is published by the ITD Department of Motor Vehicles Commercial Vehicle Services Group.
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) flow map node point event feature class identifies node locations that represent a point of interest based off the flow lines activity tracked within ITD. The nodes are tracked with a code and data specifics involving dates, location, and identification codes. The flow map node layer is used for internal purposes, therefore is not shared outside of the Roads and Highways environment.
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) functional classification event polyline feature class represents the functional classification of a roadway. This process is the recognition that individual roads and streets do not serve travel independently; rather, most travel involves movement through a network of roads. It becomes necessary then to determine how this travel can be channelized within the network in a logical and efficient manner. Functional classification carries with it expectations about roadway design, including its speed, capacity and relationship to existing and future land use development. Federal legislation uses functional classification in determining eligibility for funding under Federal Aid.
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) HPMS access control event polyline feature class identifies the degree to which access to a roadway facility is controlled or limited. It reflects how entry and exit points are managed along roadway segments, which directly impacts traffic flow, safety, and operational characteristics. Each segment is categorized into one of three levels of access control: full, partial, or none. Full access control allows entry only through grade-separated interchanges; partial access control permits some at-grade intersections or driveways; and no access control allows unrestricted property access and frequent intersections.This dataset is used for functional classification, design evaluation, access management, and network performance modeling. It supports transportation planners, engineers, and researchers in assessing corridor functionality and system efficiency. The data is maintained and updated annually as part of ITD’s Highway Performance Monitoring System (HPMS) submittal process to the Federal Highway Administration (FHWA) and is verified against roadway design records and the official state highway network. Users should note that access control classifications represent the current operational status of the roadway and may change over time as corridors are upgraded or reclassified.
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) HPMS base thickness event polyline feature class represents the thickness of the lowest pavement layer, commonly referred to as the base course, beneath the surface layer of the roadway. This information is collected and maintained as part of the HPMS inventory to support structural design, performance modeling, and pavement condition assessment.The base thickness attribute indicates the compacted depth of granular, stabilized, or treated material placed directly on the subgrade to provide load distribution and structural support. Thickness values are typically expressed in inches and derived from design plans, as built documentation, or pavement management system records.This dataset is used by engineers, planners, and researchers for evaluating pavement structure adequacy, forecasting maintenance needs, and analyzing the relationship between pavement design and performance. It is updated annually as part of ITD’s Highway Performance Monitoring System (HPMS) submittal process to the Federal Highway Administration (FHWA) and reflects current data available from pavement inventory systems and design records.
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) HPMS base type event polyline feature class represents the material composition of the base course layer located between the pavement surface and the subgrade. This information is collected and maintained as part of ITD’s HPMS inventory to support structural design, performance modeling, and pavement management analysis.The base type attribute describes the construction material used in the base layer, indicating whether it consists of untreated aggregate, stabilized material, asphaltic concrete, lean concrete, or fractured Portland Cement Concrete (PCC). These classifications help assess pavement strength, drainage, and performance characteristics.This dataset is used by engineers, planners, and researchers to evaluate pavement structure adequacy, forecast maintenance needs, and analyze relationships between pavement material types and performance outcomes. It is updated annually as part of ITD’s Highway Performance Monitoring System (HPMS) submittal process to the Federal Highway Administration (FHWA) and reflects current data available from pavement inventory systems, construction records, and design documentation.
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) HPMS capacity event polyline feature class represents the estimated hourly traffic volume that a roadway segment can carry under normal operating conditions. These values are assigned using HPMS methodologies and reflect roadway characteristics such as facility type, number of lanes, terrain, and functional classification. The layer is used by planners, analysts, and engineers to evaluate system performance, identify potential congestion, and support statewide federal reporting requirements.Capacity data originates from ITD roadway inventory records and Highway Performance Monitoring System (HPMS) annual submittals to the Federal Highway Administration (FHWA). Values are reviewed each reporting cycle to ensure alignment with current roadway conditions and federal guidance. This layer is intended to help users understand roadway performance limitations and support informed decision making.
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) HPMS facility type event polyline feature class identifies the operational design of each roadway segment, specifying whether it carries one-way or two-way traffic, functions as a ramp or non-mainline connector, or represents a non-inventory direction. Facility type classification allows for consistent network modeling and analysis of roadway characteristics within the HPMS framework.Data is derived from roadway inventory records, design documentation, and traffic operations information maintained as part of ITD’s Highway Performance Monitoring System (HPMS) reporting process to the Federal Highway Administration (FHWA). This information ensures alignment between ITD’s internal roadway data systems and federal reporting standards.The dataset is used by engineers, planners, and analysts to evaluate traffic operations, verify roadway function within the network, and maintain consistency between state and federal roadway classifications. Facility type values are reviewed and updated annually to reflect the current roadway configuration.
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) HPMS facility type event polyline feature class identifies the operational design of each roadway segment, specifying whether it carries one-way or two-way traffic, functions as a ramp or non-mainline connector, or represents a non-inventory direction. Facility type classification allows for consistent network modeling and analysis of roadway characteristics within the HPMS framework.Data is derived from roadway inventory records, design documentation, and traffic operations information maintained as part of ITD’s Highway Performance Monitoring System (HPMS) reporting process to the Federal Highway Administration (FHWA). This information ensures alignment between ITD’s internal roadway data systems and federal reporting standards.The dataset is used by engineers, planners, and analysts to evaluate traffic operations, verify roadway function within the network, and maintain consistency between state and federal roadway classifications. Facility type values are reviewed and updated annually to reflect the current roadway configuration.
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) HPMS faulting event polyline feature class represents the difference in elevation between adjacent concrete slabs at transverse joints on rigid pavements. Faulting occurs when one slab edge settles or rises relative to the next, typically due to load transfer inefficiency or erosion beneath the pavement.This measurement helps assess ride quality, structural condition, and pavement serviceability. Data is collected through field measurements or automated pavement condition surveys and is reported as the average fault height per slab joint in inches.Faulting data is used by engineers, pavement managers, and analysts to evaluate performance trends, identify maintenance needs, and model the progression of joint distress. It is maintained as part of ITD’s Highway Performance Monitoring System (HPMS) submittal process to the Federal Highway Administration (FHWA) and updated annually from the pavement condition inventory.
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) HPMS lane width event polyline feature class represents the measured or designated width of a single travel lane within a roadway segment, expressed in feet. Lane width is a critical design element that influences roadway capacity, vehicle operating speed, and overall safety performance.Values are obtained from roadway design plans, construction records, and pavement inventory systems maintained as part of ITD’s Highway Performance Monitoring System (HPMS) data collection and reporting process to the Federal Highway Administration (FHWA). Both rural and urban lane widths are recorded to support design consistency, maintenance planning, and performance monitoring.
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) HPMS last overlay event polyline feature class identifies the compacted depth of the most recent pavement layer placed over an existing roadway surface during an overlay or resurfacing project. This value reflects the thickness of new asphalt or Portland Cement Concrete (PCC) material added to restore structural integrity, ride quality, and service life.Thickness data is derived from project construction documentation, pavement design plans, and ITD’s pavement management systems. For asphalt overlays, thickness represents the compacted depth of new hot mix asphalt placed on the existing pavement. For concrete overlays, it represents the finished depth of the new concrete layer above the previous surface.This dataset is used by engineers, pavement managers, and analysts to evaluate the structural adequacy of resurfaced pavements, estimate remaining service life, and support performance modeling. It also assists in determining maintenance timing, comparing design versus constructed conditions, and verifying consistency with HPMS data submissions to the Federal Highway Administration (FHWA). Updates occur annually as part of ITD’s Highway Performance Monitoring System (HPMS) submittal cycle using the most current pavement project and inventory information.
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) HPMS median event polyline feature class identifies the type of median separating opposing lanes of traffic along divided highways. Medians improve safety and operations by reducing head-on collisions, minimizing interference from opposing traffic, and providing space for recovery, emergency stops, and potential future lanes.This information is collected from roadway design plans, construction as-built documents, and ITD’s roadway inventory systems in accordance with FHWA HPMS Field Manual coding guidance. Each median is classified by physical type and barrier characteristics.Medians may include unprotected areas, curbed separators, or positive barriers that prevent vehicle crossover. Optional sub-codes describe the rigidity of barrier types (flexible, semi-rigid, or rigid) when that level of detail is available.The dataset supports roadway safety evaluation, network inventory, and performance reporting. It is maintained and updated annually as part of ITD’s Highway Performance Monitoring System (HPMS) submission to the Federal Highway Administration (FHWA).
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) HPMS Off-Highway (OH) speed limits event polyline feature class represents the legally posted regulatory speed limit for each roadway segment included in the HPMS inventory. This attribute indicates the maximum lawful vehicle speed under ideal driving conditions, as displayed on official roadside signs.Speed limit values are expressed in miles per hour (mph) and reflect the prevailing posted speed along each segment. When different speed limits apply to different directions or vehicle classes, the value recorded represents the primary posted limit for passenger vehicles in the predominant direction of travel.This dataset is used by engineers, planners, and safety analysts to evaluate roadway performance, design consistency, and risk exposure. It also supports federal reporting, crash rate normalization, and statewide transportation modeling. The speed limit data is maintained and updated annually as part of ITD’s Highway Performance Monitoring System (HPMS) submittal to the Federal Highway Administration (FHWA).
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) HPMS ownership event polyline feature class represents the legal owner of each roadway segment in the HPMS inventory. Ownership defines which governmental or organizational entity holds jurisdictional title to the roadway right-of-way or facility.Ownership may differ from the entity responsible for maintenance or operation. For example, a roadway may be owned by the state but maintained by a county or local agency under agreement. When more than one entity has ownership interest, the code reflects the entity holding the primary title.This dataset supports jurisdictional classification, funding eligibility, and federal reporting and is updated annually as part of ITD’s Highway Performance Monitoring System (HPMS) submittal to the Federal Highway Administration (FHWA).
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) HPMS parking event polyline feature class represents the existence and characteristics of on-street parking along roadway segments, including whether parking is permitted during peak traffic periods and the total parking lane width.The peak parking attribute indicates whether parking is allowed during the peak traffic period and, if so, on which side(s) of the roadway. It helps identify time-based restrictions that affect roadway capacity and traffic flow.The parking width attribute measures the total width of designated parking lanes, expressed in feet, and includes the sum of widths on both sides of the roadway where applicable. This information supports roadway cross-section design, performance modeling, and right-of-way utilization studies.Parking information is derived from field inventories, local parking ordinances, and roadway design records. Data are reviewed and updated annually as part of ITD’s Highway Performance Monitoring System (HPMS) submittal to the Federal Highway Administration (FHWA).
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) HPMS passing sight event polyline feature class identifies the proportion of each sample section where adequate sight distance exists for safe vehicle passing in the inventory direction. This measure reflects geometric and topographic roadway characteristics that affect driver visibility and passing opportunity.Values represent the percentage of total section length that meets or exceeds FHWA-defined minimum passing sight-distance criteria for the prevailing design speed. The dataset is used in safety evaluations, highway investment modeling, and roadway performance analyses. It is updated annually as part of ITD’s Highway Performance Monitoring System (HPMS) submittal to the Federal Highway Administration (FHWA).
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) HPMS pavement event polyline feature class represents physical condition indicators collected along Idaho’s state and local federal-aid roadway network. It includes surface roughness, rut depth, cracking, and joint faulting measurements used to evaluate pavement ride quality and structural health.Condition data are collected through automated pavement survey vehicles and processed in accordance with FHWA HPMS data item definitions. These indicators help assess pavement performance trends, support State of Good Repair analysis, and inform resurfacing and reconstruction programming. The dataset is maintained and updated annually as part of ITD’s Highway Performance Monitoring System (HPMS) submittal to the Federal Highway Administration (FHWA).
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) HPMS peak lanes event polyline feature class represents the total number of through lanes available in the inventory direction during the peak travel period, while counter peak lanes capture the number of lanes open in the opposite (counter-peak) direction. These attributes help evaluate directional capacity, reversible lane operations, and congestion management strategies.The data are used by engineers, planners, and modelers to assess corridor performance, evaluate travel time reliability, and determine peak-hour operating characteristics. The dataset is reviewed and updated annually as part of ITD’s Highway Performance Monitoring System (HPMS) submittal to the Federal Highway Administration (FHWA).
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) HPMS PSR event polyline feature class represents a numerical rating of pavement ride quality and surface condition based on field observation. The Present Serviceability Rating (PSR) scale ranges from 0.0 (very poor) to 5.0 (excellent) and reflects the ability of the pavement to serve the traveling public comfortably and safely.PSR is primarily used for unpaved or local road segments where automated roughness measurements (such as International Roughness Index (IRI)) are not available. Values are determined through visual inspection or windshield surveys using standardized rating criteria. This dataset supports HPMS performance reporting, trend analysis, and maintenance prioritization, and is updated annually as part of ITD’s Highway Performance Monitoring System (HPMS) submittal to the Federal Highway Administration (FHWA).
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) HPMS section movement event polyline feature class identifies signalized and unsignalized intersection control features along roadway segments. These attributes describe signal type, timing characteristics, number of signals, stop control, and other at-grade traffic control devices that influence travel flow and operating conditions.The information is used by traffic engineers, planners, and modelers to assess corridor performance, determine capacity constraints, and support statewide transportation modeling and safety evaluation. Data are reviewed and updated annually as part of ITD’s Highway Performance Monitoring System (HPMS) submittal to the Federal Highway Administration (FHWA).
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) HPMS shoulders event polyline feature class represents the physical and functional characteristics of roadway shoulders, including surface type and width for both the left and right sides of the roadway. Shoulder data provides important context for roadway cross-section design, vehicle recovery areas, maintenance needs, and overall safety performance.Data are collected from field inventories, roadway design plans, and pavement management systems to ensure consistency with HPMS reporting requirements. The dataset is reviewed and updated annually as part of ITD’s Highway Performance Monitoring System (HPMS) submittal to the Federal Highway Administration (FHWA).
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) HPMS structure type event polyline feature class classifies roadway segments based on the presence of a major structure carrying or supporting the roadway. Structure types include bridges, tunnels, and causeways that influence roadway geometry, maintenance needs, and functional characteristics.The dataset ensures consistency between HPMS roadway data and the National Bridge Inventory (NBI) and supports structural reporting and asset management activities. It is reviewed and updated annually as part of ITD’s Highway Performance Monitoring System (HPMS) submittal to the Federal Highway Administration (FHWA).
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) HPMS surface type event polyline feature class classifies the material of the uppermost layer directly exposed to traffic. Surface type distinguishes among unpaved, bituminous, and concrete surfaces, as well as overlay configurations, providing key data for assessing pavement condition, structural integrity, and long-term performance.Surface type is a full-extent item for the National Highway System (NHS) and must be verified through visual inspection and construction records. Unpaved segments on the NHS are extremely rare and should be confirmed. The dataset is updated annually as part of ITD’s Highway Performance Monitoring System (HPMS) submittal to the Federal Highway Administration (FHWA).
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) HPMS terrain type event polyline feature class classifies roadway segments according to the general topography of the surrounding landscape, which influences vehicle speed, design standards, and operational characteristics. Terrain type reflects the overall slope and grade of the roadway corridor, not isolated features.This dataset helps determine appropriate design criteria, such as horizontal and vertical alignment, and is used in performance modeling and cost estimation. Data are reviewed and updated annually as part of ITD’s Highway Performance Monitoring System (HPMS) submittal to the Federal Highway Administration (FHWA).
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) HPMS thickness flexible event polyline feature class represents the combined compacted thickness of all flexible pavement layers constructed with asphaltic or bituminous materials. For flexible pavement structures, this includes all bound layers between the pavement surface and the top of the base course.The dataset supports pavement performance analysis, rehabilitation planning, and structural modeling in HPMS and related asset-management systems. Data are reviewed and updated annually as part of ITD’s Highway Performance Monitoring System (HPMS) submittal to the Federal Highway Administration (FHWA).
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) HPMS thickness rigid event polyline feature class represents the compacted depth, in inches, of the Portland Cement Concrete (PCC) surface layer in a rigid pavement structure. For rigid pavements, the thickness includes all PCC layers that provide structural strength to the roadway, whether reinforced or unreinforced.This dataset supports pavement performance modeling, design verification, and condition forecasting. It is reviewed and updated annually as part of ITD’s Highway Performance Monitoring System (HPMS) submittal to the Federal Highway Administration (FHWA).
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) HPMS through lanes event polyline feature class represents the number of lanes designated for through traffic movement in the inventory direction. Through lanes exclude auxiliary, turning, and parking lanes not intended for continuous travel.Associated attributes (through lanes source, ascending lanes, and descending lanes) provide supporting context for the origin of the data and direction-specific lane counts on grades.The dataset is used to evaluate roadway capacity, determine performance metrics, and support investment modeling. Data are reviewed and updated annually as part of ITD’s Highway Performance Monitoring System (HPMS) submittal to the Federal Highway Administration (FHWA).
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) HPMS TOPS event polyline feature class defines the spatial and administrative characteristics of roadway sections selected as part of Idaho’s HPMS sample panel. Each record represents a specific roadway segment used for collecting detailed pavement, traffic, and geometric data for federal reporting.This dataset is maintained within the HPMS Sections Catalog and serves as the master reference for linking field-collected sample data to the statewide roadway network. The Table of Potential Samples (TOPS) ensures statistically representative sampling across functional systems and area types.The dataset includes attributes such as the reporting year, route identifier, begin and end measures, section length, and sample ID, along with optional comment fields for internal documentation. Data are reviewed and updated annually as part of ITD’s Highway Performance Monitoring System (HPMS) submittal to the Federal Highway Administration (FHWA).
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) HPMS turn lanes event polyline feature class describes whether exclusive turn lanes are provided along a segment and the manner in which they are configured. These data help determine lane continuity, intersection control, and operational characteristics that influence capacity and performance.Turn lane data are collected through field inventories, design records, and roadway management databases and are reviewed annually as part of ITD’s Highway Performance Monitoring System (HPMS) submittal to the Federal Highway Administration (FHWA).
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) HPMS widening event polyline feature class describes the degree to which a roadway can be widened to accommodate additional lanes and identifies the presence of any constraints, such as natural, structural, or environmental obstacles.The widening potential attribute represents the estimated ability to widen the roadway on either side within the existing or potential right-of-way. The widening obstacle attribute identifies major limitations that could restrict or prevent widening, such as rivers, steep terrain, railroads, adjacent development, or environmental features.This dataset assists planners and engineers in evaluating corridor capacity expansion opportunities and in prioritizing projects for improvement. Data are reviewed and updated annually as part of ITD’s Highway Performance Monitoring System (HPMS) submittal to the Federal Highway Administration (FHWA).
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) HPMS year last construction event polyline feature class represents the calendar year when the latest major roadway construction activity was completed on a segment. Construction activities include new construction, reconstruction, major rehabilitation, resurfacing, or other substantial structural improvements that alter the pavement or cross-section.This attribute provides critical input for pavement condition modeling, deterioration rate calculations, and performance-based investment analyses. Data are derived from construction records, pavement management systems, and as-built documentation. The dataset is updated annually as part of ITD’s Highway Performance Monitoring System (HPMS) submittal to the Federal Highway Administration (FHWA).
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) HPMS year last improvement event polyline feature class represents the calendar year when the latest roadway improvement, rehabilitation, or resurfacing activity was completed. Improvements include projects intended to extend pavement life, enhance structural capacity, or improve ride quality without full reconstruction.This dataset provides critical input for pavement deterioration modeling and lifecycle planning. It reflects the timing of the last substantive upgrade that improved the functional or structural performance of the roadway. Data are updated annually as part of ITD’s Highway Performance Monitoring System (HPMS) submittal to the Federal Highway Administration (FHWA).
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) Indian reservations event polyline feature class is a linear representation of the Indian reservations polygon layer. This layer is used within external applications that summarize data based on Indian reservation boundaries but cannot utilize a polygon geometry, therefore utilize the linear features.
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Linear Referencing System (LRS) interchanges event polyline feature class shows where the interchanges are along the highways within Idaho. The data fields associated with the layer shows the interchange number and provide the information to determine if the ramp is the on or off segment along with which direction of travel the highway is.
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) intersections feature layer contains points where two or more roads or routes in the LRS meet, and they can be categorized as physically connected, not physically connected, or ambiguous. These intersections are automatically generated when routes cross and are used to support geoprocessing tasks, such as creating intersection reports and managing routes within the LRS.
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) jurisdiction event polyline feature class indicates who "owns" the road, and therefore is responsible for maintaining it. This can be a highway district, county, ITD owned, private, etc..
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Linear Referencing System (LRS) milepost signs one mile event point feature class shows the sign locations along the state highway system within Idaho. The mileposts create a system of linear referencing that allows for consistent record-keeping and administrative tasks related to road management.
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Linear Referencing System (LRS) milepost signs 1/10th mile event point feature class shows the sign locations along the state highway system within Idaho, as well as interpolated locations at approximately 1/10th of a mile interval. The mileposts create a system of linear referencing that allows for consistent record-keeping and administrative tasks related to road management.
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) national truck network event polyline feature class, also known as the National Network, was authorized by the Surface Transportation Assistance Act of 1982 (P.L. 97-424) and specified in the U.S. Code of Federal Regulations (23 CFR 658) to require states to allow conventional combinations on "the Interstate System and those portions of the Federal-aid Primary System ... serving to link principal cities and densely developed portions of the States ... [on] high volume route[s] utilized extensively by large vehicles for interstate commerce ... [which do] not have any unusual characteristics causing current or anticipated safety problems." Conventional combinations are tractors with one semitrailer up to 48 feet in length or with one 28-foot semitrailer and one 28-foot trailer, and can be up to 102 inches wide.The National Network differs in extent and purpose from the National Highway System (NHS), which was created more than a decade later by the National Highway System Designation Act of 1995 (P.L. 104-59). Both are about the same length, roughly 200,000 miles, but the National Network includes approximately 65,000 miles of highways beyond the NHS, and the NHS includes about 50,000 miles of highways that are not on the National Network. The National Network supports interstate commerce by regulating the size of trucks, while the NHS supports interstate commerce by focusing federal investments.The National Network has not changed significantly in a quarter century. It is modified only if segments are added to the Interstate highway system or if states petition to have a segment beyond the Interstate highway system added or deleted. Petitions for modifications have not been received in years, even though the geography of interstate commerce has changed significantly with the growth of smaller communities into principal cities and the emergence of new, densely developed areas. Consistency between the National Network and the freight-related portions of the more recent NHS is not required.The definition of conventional combinations is also unchanged, even though 48-feet is no longer the maximum length of a single trailer in the majority of states. Single 53-foot trailers are allowed in 25 states without special permits and in an additional 3 states subjects to limits on distance of kingpin to rearmost axle.
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) National Highway System (NHS) event polyline feature class that is more specifically referenced as the Dwight D. Eisenhower National System of Interstate and Defense Highways. It consists of routes of highest importance to the nation which connect, as directly as practical, principal metropolitan areas, cities and industrial centers. Additionally, it includes important routes into, through and around urban areas, serving national defense, and to the greatest extent possible, connect at suitable, border points with continental importance into and out of Canada and Mexico.
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Linear Referencing System (LRS) railroad crossings event point feature class provides a point location where railroads cross roads. These crossings are a necessary, but potentially dangerous, interaction between road and rail traffic.
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Linear Referencing System (LRS) road mode event polyline feature class identifies all road segments mode of travel.One-way roads carry traffic in only one direction. Interstates are divided roads with each direction of travel separated by a divider or median. The ascending direction of an interstate (in relation to the geometric measures) will have an ascending direction and the descending direction of a interstate (in relation to the geometric measures) will have a descending direction.Two-way roads carry traffic in two opposite directions, separated by a center line. Many state highways are undivided roads with no physical separation of travel. All two-way roads should have an ascending direction.
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Linear Referencing System (LRS) road names event polyline feature class includes road names for all road segments. Roads can have multiple names associated with them, especially when there are concurrent routes along the same road segment or when roads are known by more than one name.
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) road network polyline feature class is a sophisticated LRS that manages and integrates roadway data from multiple systems, enabling the location of assets, analysis of roadway characteristics, and dynamic updates of events as the network changes. It consists of interconnected routes and associated events that are spatially organized and can be accessed, edited, and shared across an organization via web services and applications, facilitating efficient management and reporting for transportation agencies.
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Linear Referencing System (LRS) road type event polyline feature class distinguishes road segments based on road type, which can be a road, ramp, or port of entry/rest area. Roads are public thoroughfares or routes used primarily for the movement of traffic. Ramps are roads that allow vehicles to enter or exit a main road safely by providing space to change speed and navigate the change in elevation if necessary. Port of Entries within states are locations where a state enforces commercial vehicle regulations. Rest Areas are facilities for travelers to rest, often located every 50-100 miles along major roads, providing amenities like restrooms and picnic tables.
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) SHS primary event polyline feature class includes only State Highway System (SHS) road segments that are the primary routes. A state highway system is a network of roads maintained by a state's government, connecting cities and smaller communities and serving as a state level transportation infrastructure. These roads, often numbered with unique shields, can range from high speed, multi-lane freeways to smaller, lower capacity roads, and their maintenance is funded through state taxes. This layer is predominately used for easily showcasing the SHS on web or physical maps.
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) state highway system event polyline feature class is a network of roads maintained by a state's government, connecting cities and smaller communities and serving as a state-level transportation infrastructure. These roads, often numbered with unique shields, can range from high-speed, multi-lane freeways to smaller, lower-capacity roads, and their maintenance is funded through state taxes.
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) urban limits event polyline feature class represents the urban boundaries which define the edges of urbanized areas, distinguishing them from surrounding rural or natural lands. They are typically implemented as Urban Growth Boundaries (UGBs), a planning tool used to contain urban sprawl by restricting development outside the defined area. UGBs promote efficient land use by encouraging compact, high-density development within the boundary and preserving open spaces and agricultural lands beyond it.
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: This layer has not been maintained. Will need to look into it. Do not share outside of Roads and Highways.
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.
Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) weight capacity event polyline feature class represents the maximum over-weight limit for particular roadway segments (non-reducible loads only). The route color code and route weight capacity code field information corresponds to the Route Capacity Map that is published by the ITD Department of Motor Vehicles Commercial Vehicle Services Group.
Service Item Id: 82d050df7a1e40a1b68715ea27e2aab1
Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.