Guidance for Traffic Signals at Diverging Diamond Interchanges and Adjacent Intersections

Objective A of this research is to develop guidance on the operational analysis and traffic signal design and operation of diverging diamond interchanges (DDIs) and adjacent traffic signals. The guide should be useful to (1) a modeler working with designers to optimize the geometric design, (2) a signal designer implementing operational strategies, (3) a signal technician wiring the cabinet(s) and programming the controller(s), and (4) an operator fine-tuning the operation of the interchange and adjacent intersection in real-time throughout the day. Objective B of this research is to identify, review, and evaluate the geometric design features and the associated safety and operational performance of in-service DDIs across the US. Two basic questions will be addressed: (1) What are the essential design characteristics of a DDI and how should an engineer utilize this information in the design of a DDI and (2) What are the safety and operational benefits of utilizing a DDI and how might the designer utilize this information in their design? Objective C of this research is to develop and deliver a training and technology transfer program for the signal timing guidelines developed under Objective A. Ten workshops will be held at different transportation agencies that have a broad range of experience with DDIs.


  • English


  • Status: Active
  • Funding: $1099875
  • Contract Numbers:

    Project 03-113

  • Sponsor Organizations:

    Federal Highway Administration

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

    American Association of State Highway & Transportation Officials (AASHTO)

    444 North Capitol Street, NW, Suite 225
    Washington, DC  United States  20001

    National Cooperative Highway Research Program

    Transportation Research Board
    500 Fifth Street, NW
    Washington, DC  United States  20001
  • Project Managers:

    Derr, B

  • Performing Organizations:

    North Carolina State University, Raleigh

    Institute for Transportation Research and Education
    Raleigh, NC  United States  27695-7908
  • Principal Investigators:

    Cunningham, Christopher

  • Start Date: 20140613
  • Expected Completion Date: 20191231
  • Actual Completion Date: 0
  • Source Data: RiP Project 37721

Subject/Index Terms

Filing Info

  • Accession Number: 01543715
  • Record Type: Research project
  • Source Agency: Transportation Research Board
  • Contract Numbers: Project 03-113
  • Files: TRB, RIP
  • Created Date: Nov 20 2014 1:04AM