Pedestrian and Bicycle Planning, Design, and Operational Issues with Alternative Intersections

New alternative intersection designs—including diverging diamond interchanges (DDI), displaced left-turn (DLT) or continuous flow intersections (CFI), restricted crossing U-turn (RCUT) intersections, median U-turn (MUT) intersections, quadrant roadway (QR) intersections—are being built in the United States. These designs may involve reversing traffic lanes from their traditional directions, so this may introduce confusion and create safety issues for pedestrians and bicyclists. In addition, pedestrian paths and bicycle facilities may cross through islands or take different routes than expected. These designs are likely to require additional information for drivers, cyclists, and pedestrians as well as better accommodations for pedestrians and bicyclists, including pedestrians with disabilities. A central concern with alternative intersections is how to provide information to pedestrians, cyclists, and drivers about the direction of car traffic, pedestrian crossing, and bicycle facilities since many designs feature unfamiliar traffic flow and patterns. Visually impaired pedestrians require information about the alignment of crosswalks, signal control, crossing time, direction of traffic, and direction through islands. Various types of paths and lane markings are being used for bicyclists, with little information about advantages and disadvantages of different strategies. The objective of this research is to identify best practices for planning and designing pedestrian and bicycle accommodations at alternative intersections. Key considerations should include wayfinding, accommodation for pedestrians with disabilities, minimizing delay for pedestrians and cyclists, increasing safety for pedestrians and cyclists, and Identifying research gaps related to safety tradeoffs. A prioritized list of research priorities for the American Association of State Highway and Transportation Officials (AASHTO) Technical Committee on Non-motorized Transportation should also be developed.


  • English


  • Status: Proposed
  • Funding: $400000
  • Contract Numbers:

    Project 07-25

  • 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
  • Project Managers:

    Rogers, William

  • Start Date: 20160509
  • Expected Completion Date: 0
  • Actual Completion Date: 0
  • Source Data: RiP Project 40802

Subject/Index Terms

Filing Info

  • Accession Number: 01598923
  • Record Type: Research project
  • Source Agency: Transportation Research Board
  • Contract Numbers: Project 07-25
  • Files: TRB, RiP
  • Created Date: May 8 2016 1:00AM