Traffic data collection
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Traffic data collection

To collect accurate and continuous traffic data, TxDOT maintains a network of over 350 permanent count sites along various roadway segments throughout the state. The data collected are used to measure the distribution and variation of traffic patterns at a particular roadway segment. 

This data then provides a general description of the roadway segment characteristics, which can then be applied to any similar roadway segment throughout the state. The data collected at each of the permanent count sites provides FHWA and TxDOT with current and past performance, which helps establish future needs and improvements of the various roadway segments in Texas.

Standard sheets

Traffic data collection sheets are for use in major pavement construction projects in truck corridors and construction or maintenance projects impacting existing traffic data collection sites or for new site installations.

Weigh-in-motion (WIM) TDC-1-08302023 TDC-1-08302023
Vehicle classification (VC) TDC-2-10072022 TDC-2-10072022
Traffic data collection (TDC) loop details TDC-3-10072022 TDC-3-10072022

Special specifications and special provisions

Title Specification / Provision PDF Rich Text Format (RTF)
Weigh-in-motion (WIM) Special Specification SS6488-002 SS6488-002
Weigh-in-motion (WIM) Special Provision SP6488-001 SP6488-001
Vehicle classification (VC) Special Specification SS6506-002 SS6506-002
Vehicle classification (VC) Special Provision SP6506-001 SP6506-001
Diamond Grinding and Grooving Pavement Special Specification SS3004 SS3004
Kistler 3-Year Certification Special Provision SP0001306 SP0001306


Statewide Planning Map

The Statewide Planning Map displays data in support of planning operations at TxDOT. Information related to TxDOT’s Permanent Data Collection Sites can be found under ‘Permanent Count Stations.’ In addition, projects that might impact a Permanent Data Collection Site can be selected based on the following: Construction underway or begins soon, Construction begins within 4 years, and Construction begins in 5 to 10 years.
Statewide Planning Map


The Statewide Traffic Analysis and Reporting System (STARS II) is a data analysis and reporting database with detailed traffic data and statistics.
Statewide Traffic Analysis and Reporting System (STARS II)

Traffic Monitoring Guide

The Traffic Monitoring Guide provides guidance, methodology, and approaches for state highway agencies to collect, analyze, report traffic data, and manage their traffic monitoring programs.
Website: Traffic Monitoring Guide (TMG) | FHWA

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