Project Title: Evaluation of Operational Efficiencies, Costs, and Accident Experience of Four Phase Single Point Urban Interchanges

Sponsor: Arizona Department of Transportation

Principle Investigator: Jim Bonneson

Research Staff:

TTI Project Number: 474050

Start Date: 6/2000

End Date: 5/2002

Abstract: The objectives of this research are to: (1).Evaluate the four phase single point urban interchange (4 SPUI) based on available accident data and conflict analysis techniques, right-of-way and construction costs, and operating efficiency; (2) compare the performance of the 4 SPUI and the conventional diamond interchange (also referred to herein as the tight-urban diamond interchange (TUDI)); (3) evaluate current 4 SPUI and diamond interchange design assumptions and operation; recommend design and/or operational changes to enhance performance; and (4) evaluate the interchange form selection (pre-design) process; recommend changes where appropriate. Guideline documents will be prepared to support the selection, design, and operation of the 4 SPUI.