Evaluation of Operational Efficiencies, Cost and Accident Experience of Four Phase Single Point Urban Interchanges

摘要

This research compares two interchanges types, the Tight Urban Diamond Interchange (TUDI) and the Four Phase Single Point Urban Interchange (40SPUI). The 40SPUI is referred to in this report as a Single Point Urban Interchange with Frontage Roads (SPUI/F). The objectives of this research are to: (1) Evaluate the SPUI/F based on available accident data and conflict analysis techniques, right-of-way and construction costs, and operating efficiency; (2) Compare the performance of the SPUI/F and the TUDI; (3) Evaluate current SPUI/F design assumptions and operation; recommend design and/or operational changes to enhance performance; (4) Evaluate the interchange form selection (pre-design) process and to recommend changes where appropriate.