A NATIONAL SURVEY OF SINGLE-POINT URBAN INTERCHANGES. INTERIM REPORT

Current trends in the design of diamond interchanges include several new configurations which are well suited to certain topographical and traffic demand constraints. Of these new types, it appears that the single-point urban interchange (SPUI) has generated the most interest. This interim report summarizes the research conducted during the first year of a three-year study. Specifically, the first year's research activity has focused on a field survey and evaluation of six SPUIs located in five states. The data collected during this field study were used to assess both the design and the operation of SPUIs. In this regard, selected design, operational, safety, structural, and economic issues have been presented and discussed in this report. Subsequent project reports will focus on an examination of SPUI capacity and delay based on analytic traffic models and field data. As a result of the survey and evaluation process, it appears that the SPUI is a viable alternative to other diamond interchange configurations in certain situations. It is adaptable to locations where right-of-way is limited and appears to operate efficiently under traditional NEMA 8-phase control. On the other hand, it does not appear to be well-suited to continuous frontage road situations because of capacity restrictions that result from an additional signal phase.

• Record URL:
  • https://library.ctr.utexas.edu/hostedpdfs/tti/1148-1.pdf
• Record URL:
  • https://rosap.ntl.bts.gov/view/dot/84918
• Corporate Authors:

  Texas Transportation Institute

  Texas A&M University System, 1600 E Lamar Boulevard
  Arlington, TX  United States  76011

  Texas State Department of Highways & Public Transportation

  Transportation Planning Division, P.O. Box 5051
  Austin, TX  United States  78763

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Bonneson, J A
  • Messer, C J
• Publication Date: 1989-3

Media Info

• Media Type: Digital/other
• Features: Appendices; Figures; References; Tables;
• Pagination: 62 p.

Subject/Index Terms

• TRT Terms: Cost effectiveness; Data collection; Diamond interchanges; Field studies; Geometric design; Highway design; Interchanges; Interchanges and intersections; Operations; Performance evaluations; Safety; Single point urban interchanges; Structural design; Urban areas; Urban highways
• Uncontrolled Terms: Operational analysis
• Subject Areas: Administration and Management; Design; Highways; Planning and Forecasting; Safety and Human Factors; I21: Planning of Transport Infrastructure;

Filing Info

• Accession Number: 00486053
• Record Type: Publication
• Report/Paper Numbers: FHWA/TX-88/1148-1, Res Rept 1148-1, TTI: 2-18-88-1148-1
• Contract Numbers: Study 2-18-88-1148
• Files: NTL, TRIS, USDOT, STATEDOT
• Created Date: Aug 31 1990 12:00AM