Synthesis of Information Related to Highway Practices. Topic 50-11. Alternative Intersection Design and Selection

Alternative intersection and interchange designs continue to grow as viable options at select locations across the United States. As defined by the Highway Capacity Manual, alternative intersections are created by rerouting one or more movements from their usual places to secondary junctions. By removing conflict points at major intersections, alternative intersections have proved to offer greater safety and operational benefits when compared to conventional at-grade intersections and grade-separate diamond interchanges. The objective of this synthesis is to identify the conditions under which state departments of transportation (DOTs) have successfully implemented alternative intersection design decisions, the critical factors in making alternative intersection design decisions, and considerations related to congestion, pedestrian movement, and right-of-way requirements. Information will be gathered through literature review, a survey of DOTs, and follow-up interviews with selected agencies for the development of case examples. Knowledge gaps and suggestions for research to address those gaps will be identified.


  • English


  • Status: Proposed
  • Funding: $45000
  • Contract Numbers:

    Project 20-05, Topic 50-11

  • Sponsor Organizations:

    National Cooperative Highway Research Program

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

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590

    American Association of State Highway and Transportation Officials (AASHTO)

    444 North Capitol Street, NW
    Washington, DC  United States  20001
  • Project Managers:

    Gause, Jo

  • Start Date: 20180723
  • Expected Completion Date: 0
  • Actual Completion Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 01669002
  • Record Type: Research project
  • Source Agency: Transportation Research Board
  • Contract Numbers: Project 20-05, Topic 50-11
  • Files: TRB, RiP
  • Created Date: May 14 2018 3:04PM