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: 4ab866d0c1c944179f14ad2355e3826c
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: 4ab866d0c1c944179f14ad2355e3826c
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: 4ab866d0c1c944179f14ad2355e3826c
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) congressional district feature class is a linear representation of the congressional districts polygon layer. This layer is used within external applications that summarize data based on congressional district boundaries but cannot utilized a polygon geometry, therefore utilize the linear features. Congressional districts are the 435 geographic areas in the U.S. that each elect one member to the House of Representatives, with boundaries drawn by states after each Census to ensure roughly equal population, though their shape and number vary by state, with populous states having more districts than less populous ones, with Idaho having only two.
Service Item Id: 4ab866d0c1c944179f14ad2355e3826c
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: 4ab866d0c1c944179f14ad2355e3826c
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: 4ab866d0c1c944179f14ad2355e3826c
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: 4ab866d0c1c944179f14ad2355e3826c
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: 4ab866d0c1c944179f14ad2355e3826c
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: 4ab866d0c1c944179f14ad2355e3826c
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: 4ab866d0c1c944179f14ad2355e3826c
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: 4ab866d0c1c944179f14ad2355e3826c
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: 4ab866d0c1c944179f14ad2355e3826c
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) maintenance district limits event polyline feature class represents areas that differ from the districts layer for locations where agreements are in place between two districts for road maintenance purposes. This layer is used within external applications that summarize data based on maintenance district boundaries but cannot utilize a polygon geometry, therefore utilize the linear features.
Service Item Id: 4ab866d0c1c944179f14ad2355e3826c
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: 4ab866d0c1c944179f14ad2355e3826c
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: 4ab866d0c1c944179f14ad2355e3826c
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) Metropolitan Planning Organization (MPO) limits event polyline feature class is a linear representation of the MPO polygon layer. This layer is used within external applications that summarize data based on MPO boundaries but cannot utilize a polygon geometry, therefore utilize the linear features. An MPO is a transportation policy-making and planning body with representatives of local, state, and federal government and transportation authorities. MPOs ensure that transportation planning in urban areas is developed cooperatively and guided by local and public input. MPOs work to balance the planning needs of local communities with the need for statewide connectivity, putting some of the planning process back in the hands of the locals. Any area with 50,000+ population must have an MPO, Idaho currently has six: Kootenai MPO in Coeur d'Alene, Lewis-Clark Valley MPO in Lewiston (Asotin, WA), Community Planning Association of Southwest Idaho in Meridian, Magic Valley MPO in Twin Falls, Bannock Transportation Planning Organization in Pocatello, and Bonneville MPO in Idaho Falls. MPOs receive funding through federal, state, and local sources for their operation. Federal transportation funds are channeled through state departments of transportation to the MPOs, but state and local government entities may also support MPO planning activities with matching grants, employee salaries and benefits, contract oversight, information technology services, and more.
Service Item Id: 4ab866d0c1c944179f14ad2355e3826c
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: 4ab866d0c1c944179f14ad2355e3826c
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: 4ab866d0c1c944179f14ad2355e3826c
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: 4ab866d0c1c944179f14ad2355e3826c
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 network primary event polyline feature class was created to help with the designation of the roads that are primary or dominate for the Circa app, along with other applications that use it for similar needs.
Service Item Id: 4ab866d0c1c944179f14ad2355e3826c
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 route dominance event polyline feature class designates which route is considered dominant when two or more signed routes overlap along the same roadway segment. This determination ensures consistency in reporting, mapping, and data analysis for overlapping corridors such as Interstate, U.S., and State routes. Dominance is typically assigned based on route hierarchy (Interstate, U.S., State, then Local), functional classification, and direction of inventory. When multiple concurrent routes exist, the dominant route is coded for inventory and data attribution purposes, while the subordinate routes are tracked as concurrent. This dataset supports system inventory accuracy, reduces duplication, and maintains consistency across route-based reporting and HPMS submissions. 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: 4ab866d0c1c944179f14ad2355e3826c
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: 4ab866d0c1c944179f14ad2355e3826c
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: 4ab866d0c1c944179f14ad2355e3826c
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.