Considerations for “Super 3” Cross-Section in High-Volume Rural Corridors with Turning Traffic

Rural high-speed two-lane roads continue to see increased volumes statewide. Traditionally, those roads might be converted to limited-access divided four-lane highways under the speeds and volumes seen today, but that level of systematic conversion is not feasible in every location. The Super 2 concept is being used across the state to provide passing opportunities and increase capacity on rural two-lane roads, but passing lanes are a treatment for through vehicles and do not address the needs of turning vehicles. As a result, there are numerous at-grade access points on rural high-speed roads that introduce potential operational delays and safety concerns, which may be compounded if passing lanes are added in locations with generators of large volumes of turning traffic. The research team will investigate the operational and safety benefits of intersection turning treatments on two-lane and Super 2 corridors, as well as best practices for designing these treatments. In this project, the research team will use existing conditions on two-lane and Super 2 corridors with and without intersection turning treatments to develop computer simulation models for evaluating the effectiveness of such treatments on operations and safety. The research team will use the evaluation results to updated guidelines that TxDOT can use to implement turning treatments on sections in or near passing lanes.


  • English


  • Status: Completed
  • Funding: $338945
  • Contract Numbers:


  • Sponsor Organizations:

    Texas Department of Transportation

    125 E. 11th Street
    Austin, TX  United States  78701-2483

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Managing Organizations:

    Texas Department of Transportation

    125 E. 11th Street
    Austin, TX  United States  78701-2483
  • Project Managers:

    Odell, Wade

  • Performing Organizations:

    Texas A&M Transportation Institute (TTI)

    400 Harvey Mitchell Parkway South
    Suite 300
    College Station, TX  United States  77845-4375
  • Principal Investigators:

    Fitzpatrick, Kay

  • Start Date: 20200102
  • Expected Completion Date: 20220430
  • Actual Completion Date: 0
  • Source Data: TxDOT Research Library

Subject/Index Terms

Filing Info

  • Accession Number: 01743944
  • Record Type: Research project
  • Source Agency: Texas Department of Transportation
  • Contract Numbers: 0-7044
  • Files: RIP, STATEDOT
  • Created Date: Jun 24 2020 6:18PM