A National Survey of Single-Point Urban Interchanges

Details

• Creators:
  Bonneson, James A. ; Messer, Carroll J.
• Corporate Creators:
  Texas Transportation Institute. Texas A&M University
• Corporate Contributors:
  Texas Department of Transportation ; United States. Department of Transportation. Federal Highway Administration
• Subject/TRT Terms:
  Geometric Design Highway Design Highway Traffic Control Interchanges Urban Highways
• Publication/ Report Number:
  FHWA/TX-88/1148-1
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Edition:
  Interim Report
• Corporate Publisher:
  Texas. Department of Transportation
• Abstract:
  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 (A).
• Format:
  PDF
• Funding:
  Study No. 2-18-88-1148
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:30a964584e4822164e5933e3c5c099b874a7013cd8e44595a1b603872437c4ef3189d2280b952de77fc2b5eee60f431f6a60e8c8508e1e2746702c0a0622792a
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/84918/dot_84918_DS1.pdf
• File Type:
  [PDF - 1.86 MB ]