Guide for Pedestrian and Bicycle Safety at Alternative Intersections and Interchanges (A.I.I.)

New alternative intersection and interchange 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, which 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 new 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, bicyclists, and drivers about the direction of car traffic, pedestrian crossing, and bicycle facilities particularly when those new intersection designs feature unfamiliar traffic flows and patterns. The concern is acute for visually impaired pedestrians, who require information about the alignment of crosswalks, signal controls, crossing times, direction of traffic, and direction through islands. Consistency in how information is provided is important as well; for example, various types of paths and lane markings are being used for bicyclists, with little information about the advantages and disadvantages of different strategies. The objective of this research is to develop a guide for transportation practitioners to improve and integrate pedestrian and bicycle safety considerations at alternative intersections and interchanges (AII) through planning, design, and operational treatments that (1) identifies and evaluates current practices, and emerging technologies and trends, in the U.S. and internationally; (2) describes current best practices for measuring the effectiveness of such AII treatments; (3) evaluates the safety and operational outcomes of specific AII treatments; and (4) identifies and ranks treatments for typical types of projects. The primary focus of the research is roadway functional classifications of collector and above. The approaches to evaluate pedestrian and bicycle treatments can be separate, but implementation of the treatments should be coordinated.

Language

  • English

Project

  • Status: Active
  • 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

  • Performing Organizations:

    Kittelson & Associates, Inc.

    2 E. congress St.
    Ste 705
    Tucson, AZ  United States  85704
  • Principal Investigators:

    Schroeder, Bastian

  • Start Date: 20170412
  • Expected Completion Date: 20190920
  • 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