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 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 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.

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: Monthly

Source: Geospatial Roadway Inventory Database (GRID)

Security Level: Public

Concurrencies are stretches of roadway which are designated as two or more routes.Update Frequency: MonthlySource: Geospatial Roadway Inventory Database (GRID)Security Level: Public

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

This dataset contains a single point for each TxDOT office location, including: State Headquarters, District Headquarters, Area Engineer Offices, Maintenance Offices and Maintenance Yards, Special District Offices, Travel Information Centers, Safety Rest Areas, and Vehicle Title and Registration Offices. This dataset does not included roadside picnic areas. Generally point locations falls near the entrance to each facility, near the front door, or at the centroid of the facility. Point locations for Travel Information Centers and Safety Rest Areas are located at the beginning of the exit ramp. Support Services Division is the Office of Primary Responsibility (OPR) for this data. Tabular data was provided to TPP and converted to GIS format then provided to local district personnel for review, edit, and comment. Date valid as of: currentUpdate Frequency: as edited in the Facilities Map

The TxDOT Bridge Data Dictionary is used to translate field names from the TxDOT Bridges dataset to item numbers in the TxDOT Bridge Coding Guide.

City limit boundaries are maintained to 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. The data was created by the Transportation Planning and Programming Division of TxDOT in the Data Analysis, Mapping and Reporting Branch. City governments submit updates to their city limits as changes are made.Update Frequency: PeriodicallySecurity Level: Public

Programmatically generated Data Dictionary document detailing the Texas Cities service.

    The PDF contains service metadata and a complete list of data fields.
    For any questions or issues related to the document, please contact the data owner of the service identified in the PDF and Credits of this portal item.


  Related Links
  Texas Cities Service URL
  Texas Cities Portal Item

Memorial highways pay tribute to notable people or groups and can be designated by the state or by local government. State-designated memorial highways are designated by the Texas Legislature and typically get 2 signs that TxDOT is responsible for maintaining. Chapter 225 of the Transportation code shows the list of legislated memorial highways and is updated after each legislative session. Any local government can designate a memorial highway; however, in order to install signage on TxDOT right of way, the proposed designation must be approved by the TxDOT Commission or Executive Director.This layer reflects the designations through the 87th legislative session, which concluded in 2021. The layer will be updated again at the conclusion of the 88th legislative session in 2023. Historic Commission Minute Orders, Historic Blue Star highways, and Odd History memorial highways are kept track of by TRF but legacy memorial highways that may not have signage. These are represented by "Other" in the field DES_TYPE.Source: Geospatial Roadway Inventory Database (GRID)Updated: Biannually Security Level: Public

Update Frequency: WeeklySource: TxDOT ConnectSecurity 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

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

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 Roadbed Surface describes the type of pavement on the surface of the roadway. Surface Type (i.e. Roadbed Surface) is a required asset for reporting to FHWA as part of the HPMS submittal. Principal factors in considering the selection of surface types are traffic, soil characteristics, weather, construction considerations, recycling opportunities, and cost comparison. See TxDOT's Pavement Manual for more information.Update Frequency: QuarterlySource: Geospatial Roadway Inventory Database (GRID)Security Level: Public

The Bridge dataset was developed using data provided by the Bridge Inspection Database. The Bridge Inspection Database contains a record for each Bridge Structure on public roadways in Texas. This includes Bridges maintained by TxDOT, Toll Authorities, Counties, Municipalities, and other jurisdictions. Bridge Inspection data is the primary source used to update the National Bridge Inspection File (NBI) in Washington. For more information on Bridge attribute data, please consult the Bridge Inspection Coding Guide and the Bridge Data Dictionary found at the links below:TxDOT Bridge Coding GuideTxDOT Bridge Data DictionaryDate valid as of: December 2021Publish Date: December 2021Update Frequency: As neededSecurity 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

Permanent count stations refer to traffic counters that operate and collect traffic data continuously, 24 hours a day, 365 days a year. Permanent traffic counters produce Annual Average Daily Traffic (AADT), and some locations may also collect classification and/or weight data. The permanent traffic counting machines and data are maintained by TxDOT TPP Traffic Section. Update Schedule: As NeededSecurity Level: Public

This version utilizes a generalized boundary along the coast, which is sometimes necessary for analysis in which it is important to encompass segments of roadways that travel over water. Roadways on bridges or causeways that span intracoastal waterways are not covered by detailed polygons that precisely follow the coastline, therefore a generalized boundary is needed for some types of analysis where it is important to preserve such relationships.Security 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