The Texas Department of Transportation (TxDOT) is exploring the use of very high design speeds to promote faster and more efficient travel, but current state and national roadway design guidance does not provide criteria for design speeds above 80 mph. This research provided TxDOT a comprehensive list of issues that could impact the design and safety evaluation of Texas' future high-speed roadways, such as the Trans-Texas Corridor. The project report presents potential values generated for design speeds of 85 to 100 mph in relation to controlling criteria, ramp design elements, and roadside items.
An extensive literature search to find existing knowledge on high-speed travel revealed gaps and limited information regarding driver performance at higher speeds. A roundtable of engineers including representatives from TxDOT's Design Division, districts, and Turnpike Authority; representatives from the Federal Highway Administration; and representatives from the project team met to examine preliminary criteria for use on higher speed roadways. Results from this project were incorporated into the TxDOT Roadway Design Manual.
For More InformationKay Fitzpatrick
Roadway Design Program
Texas A&M Transportation Institute
Texas A&M University System
College Station, TX 77843-3135
ph. (979) 845-7321 · fax (979) 845-6481