Investigating Implementation Potentials of Turbo Roundabouts in Nevada (NDOT 147-21-803)

Multi-lane roundabouts have been used as a proven safety strategy for improving intersection safety by eliminating or altering conflict types and reducing crash severity. Despite these advantages, multi-lane roundabouts have several operational challenges such as driver confusion on proper lane choice decisions, striping and signing issues, and concerns with the frequency of crashes. A relatively new form of roundabout referred to as “turbo roundabout” has the potential to reduce the limitations encountered by multi-lane roundabouts, which can effectively guide drivers to reduce lane-change conflicts common in multi-lane roundabouts. A turbo roundabout has ten conflict points compared to sixteen conflict points in a traditional two-lane roundabout. In addition to safety benefits, a turbo roundabout could provide higher capacity due to reduced conflict points. This project’s overall goal is to develop guidelines for the Nevada Department of Transportation (NDOT) on the installation and performance of turbo roundabouts. As there are no known installations of turbo roundabout in the U.S., any kind of guidance that can assist with decision making is not available for transportation engineers, professionals, and consultants. Therefore, there is a need to synthesize and summarize current research, and more importantly, develop a mechanism that guides practitioners on how to decide on the installation of a turbo roundabout, such as installation criteria, design guidelines, safety and operational performance.


    • English


    • Status: Active
    • Funding: $254102
    • Contract Numbers:


    • Sponsor Organizations:

      Nevada Department of Transportation

      1263 South Stewart Street
      Carson City, NV  United States  89712

      Federal Highway Administration

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

      Nevada DOT Research

      1263 South Stewart St
      Carson City, Nevada  United States  89712
    • Project Managers:

      Bickett, Jeff

      Koury, Lucy

    • Performing Organizations:

      West Virginia University Research Corporation, Morgantown

      886 Chestnut Ridge Road
      Morgantown, WV  United States  26506

      Ohio University

      226 Stocker Center
      Athens, Ohio  United States  45701
    • Principal Investigators:

      Naik, Bhaven

      Dey, Kakan

    • Start Date: 20210812
    • Expected Completion Date: 20230731
    • Actual Completion Date: 0
    • USDOT Program: Transportation, Planning, Research, and Development
    • Subprogram: Research

    Subject/Index Terms

    Filing Info

    • Accession Number: 01851103
    • Record Type: Research project
    • Source Agency: Nevada Department of Transportation
    • Contract Numbers: P147-21-803
    • Files: RIP, STATEDOT
    • Created Date: Jul 6 2022 6:02PM