20241015
11383300
1.0
FALSE
LRSE_AADT
2242566.095500
2743855.207300
1199159.956000
1981326.110900
1
002
Projected
GCS_North_American_1983
Linear Unit: Meter (1.000000)
NAD_1983_Idaho_TM
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20251028
11443200
20260217
14301700
20000000
5000
FGDC
Idaho Transportation Department (ITD)
Headquarters GIS
208-334-8000
PO Box 7129
Boise
Idaho
83707-1129
US
GIS-Info@itd.idaho.gov
20260217
ArcGIS Metadata
1.0
Roads and Highways - Annual Average Daily Traffic (AADT)
2025-08-26
Idaho Transportation Department (ITD)
Headquarters GIS
vector digital data
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>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. </SPAN></P><P><SPAN>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.</SPAN></P></DIV></DIV></DIV>
This dataset contains the Roads and Highways Road Network Linear Referencing System (LRS) AADT event polyline feature class which provides Annual Average Daily Traffic (AADT) counts to support transportation planning, roadway design, safety analysis, funding allocation, and research across Idaho.
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.
Idaho Transportation Department (ITD)
Roadway Data Section
208-334-8000
PO Box 7129
Boise
Idaho
83707-1129
US
trafficdata@itd.idaho.gov
Transportation
Roads and Highways
Linear Referencing System
LRS
Road Network
AADT
Annual Average Daily Traffic
Transportation
Roads and Highways
Linear Referencing System
LRS
Road Network
AADT
Annual Average Daily Traffic
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Spatial Data Disclaimer - The Idaho Transportation Department (ITD) provides this geographic data and any associated metadata “as is” without warranty of any kind, including but not limited to its completeness, fitness for a particular use, or accuracy of its content, positional or otherwise. It is the sole responsibility of the user to determine the usability of the data for their purposes. In no event shall ITD have any liability whatsoever for payment of any consequential, incidental, indirect, special, or tort damages of any kind arising out of the use of or reliance on the geographic data or metadata. In providing this data or access to it, ITD assumes no obligation to assist the user in the use of such data or in the development, use, or maintenance of any applications applied to or associated with the data or metadata.</SPAN></P></DIV></DIV></DIV>
Esri ArcGIS 13.3.4.52636
1
-117.518455
-110.666793
49.032803
41.950402
This extent represents the geographic boundaries of the state of Idaho, United States, covering all state highways and select local roads within the Road Network where AADT data has been collected.
2017-02-07T00:00:00
0.000000
1273.050000
The dataset follows established standards and conventions for logical consistency. All data elements are structured and formatted according to predefined rules, with validation processes in place to confirm consistency and accuracy.
The dataset has been reviewed to ensure all relevant traffic segment features are included.
The Idaho Transportation Department (ITD) implemented ArcGIS Roads and Highways in 2018, which is a Linear Referencing System (LRS) that manages road and highway data. It uses a data model with feature classes for routes, centerlines, and events to store and maintain roadway information, enabling accurate location management and analysis.
The Idaho Transportation Department (ITD) first implemented a Linear Referencing System (LRS) for managing road data in the 1970s, which was a mainframe-based system called the Milepoint and Coded Segment System (MACS System). In 2012, the LRS was migrated off the mainframe to Network Manager (NetMan). And finally in 2018, the LRS migrated to ArcGIS Roads and Highways. Editing stopped in NetMan in early 2017 for the migration to Roads and Highways, which is why the earliest "From Dates" on the data layers is 02/07/2017.
2017-02-07T00:00:00
249554
Roads and Highways - Annual Average Daily Traffic (AADT)
Road Network LRS Annual Average Daily Traffic (AADT)
Idaho Transportation Department
Feature Class
249554
OBJECTID
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
Object ID
OID
4
10
0
EventID
Event ID
String
38
0
0
This is an auto-generated string field to ensure uniqueness across the system.
Idaho Transportation Department
String that is auto-generated by the system.
Shape
Feature geometry.
Esri
Coordinates defining the features.
Shape
Geometry
8
0
0
RouteID
The unique identifier for a given roadway (i.e. route) for data published between 2018 and present year. Used for identifying the specific route for which the data are being reported.
The Route ID is created by the following in order:
- 5 unique numbers
- Designation of A (Ascending) or D (Descending)
- Designation of IN (Interstate), US (United States Highway), SH (State Highway), OH (Off Highway), FD (Federal Route), or PO (Polygon/Political Boundary)
- Highway number (i.e., 184, 093, etc.) or 000 for all other routes.
Idaho Transportation Department
Text field that is unique for every road in the road network.
Route ID
String
12
0
0
FromDate
The date the record was active (this can be the same date it was created or any other date in the past to 2/7/2017) in the system.
Idaho Transportation Department
Date field representing the start date.
From Date
Date
8
0
0
ToDate
The date the record was retired in the system. If this field is null then the record is still active.
Idaho Transportation Department
Date field representing the end date.
To Date
Date
8
0
0
FromMeasure
The beginning point (origin) in miles for a given section of roadway for data published between 2018 and present year. Used for identifying the beginning point of AADT roadway section being reported.
Idaho Transportation Department
This field is automatically coded in reference to the road network.
From Measure
Double
8
38
8
EstablishedDate
Established Date
Date
8
0
0
Date used for events that do smoothing or bulk load processes and need to track based on year start or end date.
Idaho Transportation Department
Date field representing established date.
SystemCreateDate
System Create Date
Date
8
0
0
The date that the record was created in the system. This date does not have to match the From Date or Established Date fields.
Idaho Transportation Department
Date field that is auto-generated by editor tracking.
UserCreate
User Create
String
255
0
0
The username who created the record in the system.
Idaho Transportation Department
String field that is auto-generated by editor tracking.
SystemModifyDate
System Modify Date
Date
8
0
0
The date that the record was modified in the system. This date does not have to match the From Date or Established Date fields.
Idaho Transportation Department
Date field that is auto-generated by editor tracking.
UserModify
User Modify
String
255
0
0
The username who last modified the record in the system. At first creation, this will match the User Create field, but will change as the record is modified.
Idaho Transportation Department
String field that is auto-generated by editor tracking.
LocError
Location Error
String
100
0
0
The location error field indicates if there are data quality issues for Linear Referencing System (LRS) events, showing a status in the event layer's attribute table, with "No Error" meaning the event is accurate and any other status indicates a problem that needs resolution. It helps identify issues like events not being correctly located on a route or events created with incorrect measures that must be updated to ensure accurate data representation.
Idaho Transportation Department
String field representing a location error.
ToMeasure
The ending point (terminus) in miles for a given section of roadway for data published between 2018 and present year. Used for identifying the ending point of AADT roadway section being reported.
Idaho Transportation Department
This field is automatically coded in reference to the road network.
To Measure
Double
8
38
8
AADT
Annual Average Daily Traffic (AADT). The average number of vehicles that travel on a specific road segment over a full year, divided by the number of days in the year, representing the typical daily traffic volume for a given road.
Idaho Transportation Department
Number field representing the AADT totals.
AADT
Integer
4
10
0
DescriptionFrom
Roadway description for beginning location (origin) of Annual Average Daily Traffic (AADT) roadway section being reported.
Idaho Transportation Department
Text field of a road(s) name.
Description From
String
40
0
0
DescriptionTo
Roadway description for ending location (terminus) of Annual Average Daily Traffic (AADT) roadway section being reported.
Idaho Transportation Department
Text field of a road(s) name.
Description To
String
40
0
0
PassengerAADT
Passenger Annual Average Daily Traffic (PAADT). The average number of passenger vehicles that travel on a specific road segment over a full year, divided by the number of days in the year, representing the typical daily traffic volume for a given road. PAADT specifically focuses on passenger vehicles rather than all vehicle types.
Idaho Transportation Department
Number field representing the passenger AADT totals.
Passenger AADT
Integer
4
10
0
CommercialAADT
Commercial Annual Average Daily Traffic (CAADT). The average number of commercial vehicles that travel on a specific road segment over a full year, divided by the number of days in the year, representing the typical daily traffic volume for a given road. CAADT specifically focuses on commercial vehicles, such as heavy trucks, rather than all vehicle types.
Idaho Transportation Department
Number field representing the commercial AADT totals.
Commercial AADT
SmallInteger
2
5
0
EffectiveDate
The effective date for which the data are being reported. Typically represented as January 1st of the calendar year for which the data are being reported.
Idaho Transportation Department
Date field representing the AADT effective date.
Effective Date
Date
8
0
0
ExpirationDate
The expiration date for which the data are being reported. Typically represented as January 1st of the following calendar year for which the data are being reported.
Idaho Transportation Department
Date field representing the AADT expiration date.
Expiration Date
Date
8
0
0
PassengerGrowthFactor
Growth factors are assigned to all Annual Average Daily Traffic (AADT) sections in the AADT database, including state system, federal routes, and local roads. There are separate factors for passenger and commercial vehicles. There are also default factors for counties and some cities, which are used for total traffic. Passenger growth factors represent annual growth for passenger vehicles and are typically intended to be used for 20 and 40-year AADT traffic volume and ESAL projection reports. The factors were originally developed based on 20-year spans, so that they would reflect long-term growth rather than annual ups and downs.
Idaho Transportation Department
Number field representing the passenger growth factor.
Passenger Growth Factor
Double
8
38
8
CommercialGrowthFactor
Growth factors are assigned to all Annual Average Daily Traffic (AADT) sections in the AADT database, including state system, federal routes, and local roads. There are separate factors for passenger and commercial vehicles. There are also default factors for counties and some cities, which are used for total traffic. Commercial growth factors represent annual growth for commercial vehicles and are typically intended to be used for 20 and 40-year AADT traffic volume and ESAL projection reports. The factors were originally developed based on 20-year spans, so that they would reflect long-term growth rather than annual ups and downs.
Idaho Transportation Department
Number field representing the commercial growth factor.
Commercial Growth Factor
Double
8
38
8
DHVAFactor
Design Hourly Volume (DHV). The traffic volume during a specific hour of the day that is used for highway planning and design purposes. DHV is typically represented by the 30th highest hourly volume of the future year chosen for design.
DHV factors are reviewed by plotting the DHV against the Annual Average Daily Traffic (AADT), and grouped by seasonal factors. The grouped values are then plotted to review the amount of variation. When the groups are acceptable, the factors are calculated from all sites and all years within each group. The slope and the intercept of the line of DHV plotted against the AADT is then produced. The DHVA factor is the intercept and the DHVB factor is the slope. These factors are then extended to all AADT roadway sections being reported.
Idaho Transportation Department
Number field representing the design hourly volume.
DHVA Factor
Double
8
38
8
DHVBFactor
Design Hourly Volume (DHV). The traffic volume during a specific hour of the day that is used for highway planning and design purposes. DHV is typically represented by the 30th highest hourly volume of the future year chosen for design.
DHV factors are reviewed by plotting the DHV against the Annual Average Daily Traffic (AADT), and grouped by seasonal factors. The grouped values are then plotted to review the amount of variation. When the groups are acceptable, the factors are calculated from all sites and all years within each group. The slope and the intercept of the line of DHV plotted against the AADT is then produced. The DHVA factor is the intercept and the DHVB factor is the slope. These factors are then extended to all AADT roadway sections being reported.
Idaho Transportation Department
Number field representing the design hourly volume.
DHVB Factor
Double
8
38
8
TruckDensity
The ‘truck density’ factor describes the percentage of commercial vehicles in the Commercial Annual Average Daily Traffic (CAADT). In general, the truck density factor is based on the percentage of two types of vehicles within the commercial vehicle count: the two-axle dual-tired trucks and the five-axle tractor-trailers. The factors range from 1-4: Light, Medium, Heavy, and Light/Heavy.
- Light = 71% or more 2-axle commercial and 9% or less 5-axle combination
- Medium = 50-70% 2-axle commercial and 10-25% 5-axle combination
- Heavy = 49% or less 2-axle commercial and 26% or more 5-axle combination
- Light/Heavy = other
Idaho Transportation Department
Number field representing truck density.
Truck Density
Double
8
38
8
LaneDistribution
The lane distribution represents the decimal form of the percentage of vehicles in the right-most lane that are commercial.
Idaho Transportation Department
Number field representing lane distribution.
Lane Distribution
Double
8
38
8
AADTYear
The calendar year for which the Annual Average Daily Traffic (AADT) data are being reported.
Idaho Transportation Department
Number field representing a 4-digit year.
Year
Integer
4
10
0
AADT_Default
Used internally by ITD Roadway Data staff to capture special conditions related to the Annual Average Daily Traffic (AADT) roadway section being reported. Example: representing a new AADT section as a result of being added to the federal aid system but counts may not have been officially conducted on yet.
Idaho Transportation Department
Number field representing the AADT default information.
0
No
Idaho Transportation Department
1
Yes
Idaho Transportation Department
AADT_Default
SmallInteger
2
5
0
DHV
Design Hourly Volume (DHV). The traffic volume during a specific hour of the day that is used for highway planning and design purposes. DHV is typically represented by the 30th highest hourly volume of the future year chosen for design.
Idaho Transportation Department
Number field representing design hourly volume.
DHV
Integer
4
10
0
StationID1
Used internally by ITD Roadway Data staff during Annual Average Daily Traffic (AADT) estimation process. Station ID 1 represents the primary assigned station location for the specific AADT roadway section being reported. If a permanent continuous count site (CCS) exists within the roadway section being reported, that CCS site will default to the primary Station ID 1. If no CCS site exists, a portable-short-term count location best representing that roadway section traffic volume is chosen. These locations are considered the best locations for scheduling portable short-term counts during a normal count season cycle that would provide consistent and valid AADT estimate trends over time.
Idaho Transportation Department
Text field representing the primary assigned station.
Station ID 1
String
19
0
0
StationID2
Used internally by ITD Roadway Data staff during Annual Average Daily Traffic (AADT) estimation process. Station ID 2 represents the secondary assigned station location for the specific AADT roadway section being reported. These locations are typically used as a backup to Station ID 1 locations for capturing count data, representing the second best location for scheduling portable short-term counts during a normal count season cycle that would provide consistent and valid AADT estimate trends over time.
Idaho Transportation Department
Text field representing the secondary assigned station.
Station ID 2
String
19
0
0
StationIDComment
Used internally by ITD Roadway Data staff to capture any specific notes, caveats, or special conditions related to the assigned Station ID 1 and Station ID 2 locations in relation to the Annual Average Daily Traffic (AADT) roadway section being reported.
Idaho Transportation Department
Text field for adding comments.
Station ID Comment
String
256
0
0
MADT1
Monthly Average Daily Traffic (MADT) for the month of January for data published between 2022 and present year.
Idaho Transportation Department
Number field representing the monthly ADT totals.
MADT (Jan)
Integer
4
10
0
MADT2
Monthly Average Daily Traffic (MADT) for the month of February for data published between 2022 and present year.
Idaho Transportation Department
Number field representing the monthly ADT totals.
MADT (Feb)
Integer
4
10
0
MADT3
Monthly Average Daily Traffic (MADT) for the month of March for data published between 2022 and present year.
Idaho Transportation Department
Number field representing the monthly ADT totals.
MADT (Mar)
Integer
4
10
0
MADT4
Monthly Average Daily Traffic (MADT) for the month of April for data published between 2022 and present year.
Idaho Transportation Department
Number field representing the monthly ADT totals.
MADT (Apr)
Integer
4
10
0
MADT5
Monthly Average Daily Traffic (MADT) for the month of May for data published between 2022 and present year.
Idaho Transportation Department
Number field representing the monthly ADT totals.
MADT (May)
Integer
4
10
0
MADT6
Monthly Average Daily Traffic (MADT) for the month of June for data published between 2022 and present year.
Idaho Transportation Department
Number field representing the monthly ADT totals.
MADT (Jun)
Integer
4
10
0
MADT7
Monthly Average Daily Traffic (MADT) for the month of July for data published between 2022 and present year.
Idaho Transportation Department
Number field representing the monthly ADT totals.
MADT (Jul)
Integer
4
10
0
MADT8
Monthly Average Daily Traffic (MADT) for the month of August for data published between 2022 and present year.
Idaho Transportation Department
Number field representing the monthly ADT totals.
MADT (Aug)
Integer
4
10
0
MADT9
Monthly Average Daily Traffic (MADT) for the month of September for data published between 2022 and present year.
Idaho Transportation Department
Number field representing the monthly ADT totals.
MADT (Sep)
Integer
4
10
0
MADT10
Monthly Average Daily Traffic (MADT) for the month of October for data published between 2022 and present year.
Idaho Transportation Department
Number field representing the monthly ADT totals.
MADT (Oct)
Integer
4
10
0
MADT11
Monthly Average Daily Traffic (MADT) for the month of November for data published between 2022 and present year.
Idaho Transportation Department
Number field representing the monthly ADT totals.
MADT (Nov)
Integer
4
10
0
MADT12
Monthly Average Daily Traffic (MADT) for the month of December for data published between 2022 and present year.
Idaho Transportation Department
Number field representing the monthly ADT totals.
MADT (Dec)
Integer
4
10
0
GlobalID
GlobalID
GlobalID
38
0
0
A Universally Unique Identifier (UUID) that is automatically generated and assigned to a feature. This field is not editable by users and is maintained by the software.
Idaho Transportation Department
Global ID field that is auto-generated by the system.
AADTSource
Used internally by ITD Roadway Data staff to capture Annual Average Daily Traffic (AADT) estimation source for AADT roadway section being reported. The AADT Source field represents whether the AADT estimate being reported was derived from a permanent “continuous count”, portable “short-duration count”, an “estimation” method, or other “other” type of estimation source.
Idaho Transportation Department
Coded value domain representing the AADT Source.
0
Unknown
Idaho Transportation Department
1
Continuous Count
Idaho Transportation Department
2
Short Duration Count
Idaho Transportation Department
3
Estimated Count
Idaho Transportation Department
4
Other
Idaho Transportation Department
AADT Source
SmallInteger
2
5
0
Shape.STLength()
Length of feature in internal units.
Esri
Positive real numbers that are automatically generated.
Shape.STLength()
Double
0
0
0
Enterprise Geodatabase Feature Class
dataset
EPSG
9.5.1(10.8.0)
Simple
FALSE
249554
TRUE
TRUE