Using more accurate technology, the Texas Department of Transportation (TxDOT) unveiled an updated list of Texas’ 100 most congested roadway segments earlier this month. In developing the update, the state used actual traffic speed data to calculate delay, rather than estimations based on traffic volume used in the previous list. Parameters for roadway segment length were also adjusted to better capture congested points in the transportation system. The results of this heightened accuracy have state engineers a little excited and encouraged. As a result of the increased accuracy of the data and methodology behind the list, several roadway segments have shifted rankings on the list. The top 100 list includes the state highway system, and many city, county or toll road segments. Additionally, it now considers both weekday and weekend congestion levels to provide a congestion ranking based on delay experienced all days of the week. Nationally recognized congestion experts with the Texas Transportation Institute (TTI) at Texas A&M University collaborated with TxDOT to develop the new list and improved methodology. “Texans have known for some time that traffic is bad – but this new list accurately pinpoints the traffic hotspots in the state, and will help make sure transportation planners consider these roadways when prioritizing roadway and transit projects,” said Dr. Tim Lomax, Research Engineer with TTI, who coordinated with TxDOT staff to develop the list. “TTI has long distributed reports on congestion levels throughout the United States, including those levels in Texas, but the new methods used in this analysis are on the cutting edge of traffic congestion measurement.” TxDOT first launched a 100 most congested roadways list in 2009 at the direction of the Texas Legislature. The updated 100 most congested roadways list, additional information about methodology and plans for congestion mitigation are available by visiting

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