The TxDOT Roadway Inventory is a statewide dataset of attribute data routed to TxDOT's roadway network linework using linear referencing. Roadways are dynamically segmented whenever a single attribute changes, resulting in a highly segmented network that can be queried and filtered for specific attribute values. Attributes such as functional system, traffic counts, surface type, speed limits and many more are contained within. This layer is published annually based on end-of-year data that is reported to the Federal Highway Administration. This layer is highly segmented and thus in a different format than most of our regularly published datasets, which are segmented based on a single attribute. The TxDOT Roadway Inventory layer can also be found on txdot.gov and TxDOT’s Open Data Portal. This product is created annually by the Transportation Planning and Programming Division at TxDOT in the Data Analysis, Mapping and Reporting Branch for internal and public use.Security Level: PublicUpdated: AnnuallyLast Revision: 09/12/2024TxDOT Roadway Inventory Specifications 2023 AGO OverviewTxDOT Roadway Inventory Specifications 2023 PDF link in AGO

The Texas Department of Transportation (TxDOT) maintains a spatial dataset of roadway polylines for planning and asset inventory purposes, as well as for visualization and general mapping. This dataset covers the state of Texas and includes on-system routes (those that TxDOT maintains), such as interstate highways, U.S. highways, state highways, and farm and ranch roads, as well as off-system routes, such as county roads and local streets. Route segments in this version of TxDOT Roadways are broken by functional classification. For an unsegmented version of TxDOT Roadways, see TxDOT Roadways Unsegmented.This data contains measures. Measures are stored as M-values within each vertex along the line, in the same way that some datasets store z-values for the elevation, except that measures store the distance from the origin, or DFO, along the line. M-enabled networks serve as frameworks for locating roadway assets along the network using linear referencing. This data set must be downloaded as a file geodatabase in order to keep M-Values intact. If downloaded as a shapefile or added to a map from a connection to ArcGIS online, measures will not be applied to the line.Update Frequency: MonthlySource: Geospatial Roadway Inventory Database (GRID)Security Level: Public

A statewide point dataset of Texas Reference Marker locations maintained by the Transportation Planning and Programming Division of TxDOT. Reference Markers are extracted from the Geospatial Roadway Inventory Database (GRID), where they are maintained as an asset. Reference Markers are located along all on-system (i.e. state maintained) Texas roadways at 2-mile intervals, with the exception of interstate highways, which have markers at 1-mile intervals. Reference markers are used as a linear referencing system for project planning, asset management, and as a location reference in the field.Update Frequency: MonthlySource: Geospatial Roadway Inventory Database (GRID)Security Level: Public

The National Highway System (NHS) consists of roadways important to the nation's economy, defense, and mobility (Interstates, Other Principal Arterials, Strategic Highway Network, Major Strategic Highway Network Connectors, and Intermodal Connectors).This statewide NHS dataset is maintained by the Transportation Planning and Programming Division per Federal Highway Administration requirements, and to serve as a base layer for TxDOT's cartographic products.Update Frequency: AnnuallySource: Geospatial Roadway Inventory Database (GRID)Security Level: Public

The Transportation Planning and Programming (TPP) Division of the Texas Department of Transportation (TxDOT) created this GIS roadway network from a historic paper map for the purpose of visualization and general mapping, in celebration of TxDOT's centennial. http://www.txdot.gov/txdot100/ This dataset covers the state of Texas and includes the state highways adopted by the State Highway Department in June 1917. This system of highways is merely intended to be indicative of the general direction of the routes and is only approximate in location between designated points.Update Frequency: NeverSecurity Level: Public

​​​​​​​​​​​​​​​​​​Medians are paved or landscaped areas in the middle of roadways that separate traffic traveling in opposite directions. Medians must present some sort of physical barrier to a driver. This usually takes the form of a raised curb, or grassy space between divided roadbeds. Paint lines do NOT count as a median. A roadbed is only considered to have a median if the total length of the median is longer than .1 miles (1/10 of a mile) before a major intersection or other significant break. A median with small breaks for left turns onto small side streets that don't have some sort of intersection control (and typically don't break the length of the median by more than 100 feet or so) is considered to be 'continuous'. Metadata date 8.31Update Frequency: Bi-AnnuallySource: Geospatial Roadway Inventory Database (GRID)Security Level: Public

City point locations are derived from boundary polygons of incorporated cities using the centroid of the polygon. Additional unincorporated points are also included. The data was created by the Transportation Planning and Programming Division of TxDOT in the Data Analysis, Mapping and Reporting Branch as a base layer for TxDOT's Cartographic products.Publish Date: June 2024Update Frequency: QuarterlySecurity Level: Public

A dataset of county polygons as used by TxDOT. These boundaries enable the classification of roadway inventory attributes, satisfy federal and state roadway reporting requirements, and serve as a base layer for TxDOT's cartographic products This data utilizes a detailed boundary along the Texas coast for depicting a realistic coastline.Security Level: Public

The TxDOT DCIS Projects service layer is a dataset of roadway construction and maintenance projects that are either currently under construction, or are in some phase of the planning process. Projects are grouped into 4 categories: projects that are currently underway or begins soon; projects in the construct authority (begins within the next four years); projects in the develop authority (planned to begin in 5 to 10 years); and projects in the initial phases of project development (corridor studies, construction in 10+ years). The dataset excludes non-letting projects. It is updated weekly and used in TxDOT's Project Tracker application.Update Frequency: NightlySource: TxDOT ConnectSecurity Level: Public

TxDOT_Vector_Tile_Basemap Utilized for Statewide Planning Map and Project Tracker along with any other application that can use a basemap to find locations.This specifically give a light gray appearance, rather than brightly colored.

The TxDOT Vertical Clearance dataset displays a range of vertical clearances for bridge structures on the statewide roadway network. Vertical clearance is defined as the vertical distance between the roadway surface and the bottom surface of a bridge, overhead sign, or other overhead obstruction. Data derived is a general representation of the Bridge Underclearance Database maintained by the Bridge Division of TxDOT.Date valid as of: January 2025Publish Date: January 2025Update Frequency: As neededSecurity Level: Public

Rumble strips are roadway safety features built into or applied over the road in order to create a vibration and sound to alert an inattentive driver that they are departing the lane. Update Frequency: MonthlySource: Geospatial Roadway Inventory Database (GRID)Security Level: Public

This dataset was created by the Transportation Planning and Programming (TPP) Division of the Texas Department of Transportation (TxDOT) for planning and asset inventory purposes, as well as for visualization and general mapping. It is comprised of all 25 TxDOT Districts. This layer was recently updated to include the district types: Rural, Metro and Urban.Update Frequency: As NeededSource: Transportation Planning and Programming Division (TPP) | Data ManagementSecurity Level: PublicOwned by TxDOT: TrueRelated LinksData Dictionary PDF [Generated 2025/02/24]

This is a public and downloadable traffic data product of statewide average annual daily traffic (AADT) counts. Annual average daily traffic is a measure of transportation system use that represents the typical traffic volume at a location. Standard traffic monitoring AADT calculation methods vary depending on traffic data collection equipment, data type, and frequency. The TxDOT AADT count data in this layer is calculated as 24 hour volume pneumatic tube count x Axle Correction Factor x Monthly Adjustment Factor. In a small number of cases, other methods may be used at TxDOT's discretion.Updated: Annually in JulySource: Statewide Traffic Analysis and Reporting System IISecurity Level: Public

User guide for the ArcGIS Online Statewide Traffic Count AppThe guide covers essential aspects, including:Map Functions Overview: This section details the basic interactive functions of the map, including zooming, panning, and identifying features. It will explain how to navigate the map interface effectively, find specific locations, and understand the map's overall layout and controls. Turn Layers On and Off: This portion of the guide will teach users how to control the visibility of different data layers within the map. Users will learn how to toggle layers on and off to customize the map display, focusing on specific traffic count data or related information. This allows for a more focused analysis of the data. Attribute Table and Export Data: This section explains how to access and utilize the attribute table associated with the traffic count data. Users will learn how to view detailed information about each traffic count location, including specific count values, dates, and other relevant attributes. Furthermore, this section will instruct how to export the attribute table data into formats like CSV or Excel for further analysis outside of the online application. Downloading Data: This portion of the guide will explain how to download the traffic count data. It will explain what file types are available for download, and any restrictions that are placed on the data.

2023 End of Year roadway data that includes TxDOT highway information for Single Roadbed, Left Frontage and Right Frontage roadbeds. This dataset is produced annually.

​The outside shoulder refers to the type of shoulder to the outside of the route in the case of a divided roadway. If the roadway is represented by a single, centerline (KG) then it's to the right of the route in the direction of inventory.​​​Update Frequency: MonthlySource: Geospatial Roadway Inventory Database (GRID)Security Level: Public

Maintenance Section Boundaries are derived from the Maintenance Section Routes and includes the full county, or counties, those routes may be within and any neighboring portions of counties those routes may extend into.

Maintenance Section Offices are the second administrative subdivision under TxDOT Districts and Area Engineer Offices.

The Geospatial Roadway Inventory Database application (GRID) is the "system of record" for storing roadway maintenance designation. The maintenance office designation is coded onto every on-system (state owned) road as a linear feature.

Updated Frequency: Monthly

Source: Geospatial Roadway Inventory Database (GRID)

Security Level: Public

Each year, the Transportation Planning and Programming (TPP) Division of the Texas Department of Transportation (TxDOT) contracts with Texas A&M Transportation Insititute (TTI) to identify and rank the most congested roadways in the state. Approximately 1800 route segments are provided to TTI and combined with speed and traffic data for the anlysis. The top 100 are ranked and included in this dataset.Update Frequency: Annually Source: Geospatial Roadway Inventory Database (GRID)Security Level: Public

The Statewide Connectivity Corridors represent the Texas Transportation Commission approved corridors under the Unified Transportation Program’s Category 4 funding category. Category 4 provides funding for mobility and added capacity projects on major state highway system corridors, which provide statewide connectivity between urban areas and corridors. This network is composed of: Texas Trunk SystemNational Highway System (NHS) Connections from the Texas Trunk System or the NHS to major ports on international borders or Texas water portsNational Freight NetworkTexas Freight Network Hurricane Evacuation Routes

Link to Web Map: http://arcg.is/1m4KXX0Security Level: Public