Readily Implementable Signal Phasing Schemes for Diverging Diamond Interchanges

Diverging Diamond Interchanges (DDI) are emerging as an efficient alternative to conventional diamond interchanges with proven safety and operational efficiency. The number of DDIs is expected to increase significantly in the U.S. over the next decade. While geometric design of DDIs is getting mature based on experiences from existing sites, traffic operations, particularly the various signal phasing schemes, are not yet well defined and recognized. This paper provides five feasible signal phasing schemes which can be easily implemented using standard NEMA 8- phase signal controllers. Discussions are provided regarding the advantages and disadvantages of each phasing scheme. These phasing schemes should be implemented according to the specific traffic pattern and geometric layout of DDI sites in order to achieve the best operational performance. Other relevant issues included in the paper are pedestrian handling, yellow change and red clearance intervals at DDIs.

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• Supplemental Notes:
  • This paper was sponsored by TRB committee AHB25 Traffic Signal Systems.
• Corporate Authors:

  Transportation Research Board

  500 Fifth Street, NW
  Washington, DC  United States  20001
• Authors:
  • Tian, Zong
  • Xu, Hao
  • de Camp, Gerry
  • Kyte, Michael
  • Wang, Yinhai
• Conference:
  • Transportation Research Board 94th Annual Meeting
  • Location: Washington DC, United States
  • Date: 2015-1-11 to 2015-1-15
• Date: 2015

Language

• English

Media Info

• Media Type: Digital/other
• Features: Figures; References;
• Pagination: 11p
• Monograph Title: TRB 94th Annual Meeting Compendium of Papers

Subject/Index Terms

• TRT Terms: Diamond interchanges; Geometric design; Highway traffic control; Off ramps; Traffic signal control systems; Traffic signal phases
• Uncontrolled Terms: Diverging diamond interchanges
• Subject Areas: Highways; Operations and Traffic Management; I21: Planning of Transport Infrastructure; I73: Traffic Control;

Filing Info

• Accession Number: 01551180
• Record Type: Publication
• Report/Paper Numbers: 15-0723
• Files: PRP, TRIS, TRB, ATRI
• Created Date: Jan 27 2015 11:21AM