Operational Effects of Diverging Diamond Interchange

The Diverging Diamond Interchange (DDI) can be a very attractive interchange option due to its efficient design that improves traffic flow and reduces conflict points at relatively low costs. A better understanding on how the DDI works could improve traffic operations and help in design criteria. This paper will introduce theories on how the DDI works by examining the signal progressions both within the interchange and outside of the interchange. The paper will explain how a better understanding of this theory can provide guidance to designers for decisions on crossover speed and location. The theories will also show how traffic engineers can make better decisions in choosing cycle lengths for the DDI and the adjacent signal system. Additionally, this paper will introduce a DDI that allows thru movements for the ramp traffic based on the better understanding of the signal progressions that this paper presents.


  • English

Media Info

  • Media Type: DVD
  • Features: Figures; References;
  • Pagination: 15p
  • Monograph Title: TRB 89th Annual Meeting Compendium of Papers DVD

Subject/Index Terms

Filing Info

  • Accession Number: 01154417
  • Record Type: Publication
  • Report/Paper Numbers: 10-1605
  • Files: TRIS, TRB
  • Created Date: Jan 25 2010 10:42AM