Public Perception of Double Crossover Diamond Interchanges

A double crossover diamond (DCD) interchange (a.k.a. diverging diamond interchange) is a new unconventional diamond-type interchange. The purpose of this interchange design is to accommodate left-turning movements onto arterials and limited-access highways while eliminating the need for a left turn bay and signal phase at the ramp terminals. During a large study sponsored by the Federal Highway Administration, the research team examined how users perceived new DCD interchanges using focus groups formed at three DCD sites with 20 total participants and attitudes summarized from surveys conducted at two DCD sites with a total of 1,649 participants. The team further explored the results of one of the surveys, comparing opinions expressed before and after the installation of a DCD. The results from both the focus groups and surveys revealed that DCD interchanges operated properly, but there is room for improvement in how these interchanges might be more readily accepted by the public. In regards to general knowledge and comfort with the interchange and safety (real or perceived), users generally thought the interchange was an improvement over the existing facility. The most frequently reported issues are summarized for further consideration in outreach, education, planning, or design. Specific changes could be made in regards to the scope of the project to include adjacent interchanges, adjustments with signal operations, and the inclusion of facilities to accommodate both bicyclist and pedestrian travel to increase user satisfaction with DCD interchanges.

  • Record URL:
  • Supplemental Notes:
    • Abstract reprinted with permission from the Institute of Transportation Engineers.
  • Authors:
    • Jackson, Kristy
    • Cunningham, Christopher M
    • Yeom, Chunho
    • Hummer, Joseph E
    • Kirk, Adam
  • Publication Date: 2014-7


  • English

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Filing Info

  • Accession Number: 01538705
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Sep 26 2014 2:24PM