Impacts of Connected Vehicles and Automated Vehicles on State and Local Transportation Agencies--Task-Order Support. Safety Implications in a Mixed Vehicle Environment

C/AV technologies offer potentially transformative impacts on the transportation network and the traveling public. The adoption of these technologies, however, will take place over decades which will result in an interim mixed driving environment with regular, semi-automated, and highly-automated vehicles sharing the same roadway. This sustained mixed driving environment may raise currently un-anticipated safety issues that need to be considered as C/AVs enter the market. A 2017 report prepared for the Governors Highway Safety Association suggests that C/AV research has largely focused on the technology associated with deploying automated driving systems, whereas highway safety risks have largely been unconsidered. This report continues to say that C/AVs are expected to introduce new safety risks, especially within the long transition period where mixed driving fleets occupy the transportation network and recommends the development of a "Traffic Safety Implications of Automated Vehicles" report to document these issues and encourage state officials to raise awareness of traffic safety concerns in C/AV planning efforts ( Following the recommendations of this report and numerous other calls to action, the purpose of this project is to raise awareness of these challenges through explicit identification of potential issues and develop a risk assessment based on a thorough review of findings from ongoing and completed research evaluating safety in a mixed fleet.

  • Record URL:
  • Supplemental Notes:
    • This project is combined with NCHRP Project 17-91 Assessing the Impacts of Automated Driving Systems (ADS) on the Future of Transportation Safety. NCHRP 17-91 and BTSCRP BTS-07 have been expanded in scope and budget to include this project.


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  • Status: Terminated
  • Contract Numbers:

    Project 20-102(32)

  • Sponsor Organizations:

    National Cooperative Highway Research Program

    Transportation Research Board
    500 Fifth Street, NW
    Washington, DC  United States  20001

    American Association of State Highway and Transportation Officials (AASHTO)

    444 North Capitol Street, NW
    Washington, DC  United States  20001

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Start Date: 20210906
  • Expected Completion Date: 0
  • Actual Completion Date: 20210906

Subject/Index Terms

Filing Info

  • Accession Number: 01781356
  • Record Type: Research project
  • Source Agency: Transportation Research Board
  • Contract Numbers: Project 20-102(32)
  • Files: TRB, RIP
  • Created Date: Sep 6 2021 9:35PM