Abstract
The single-point urban interchange (SPUI) is a relatively new type of diamond interchange. Its reported advantages are improved operational efficiency, improved safety, and reduced right-of-way requirements as compared to other interchange forms. This paper focuses on the efficiency and right-of-way requirement issues by examining the relationships among the various SPUI design elements. In particular, constraints placed on the SPUI geometry by the bridge-abutment locations and offset left-turn paths made it possible to develop a geometric model relating turn radius, cross-section width, number and width of turn lanes, and skew angle to bridge length and clearance path length. A sensitivity analysis using the geometric model developed in this paper indicates that skew angle, cross-road median width, and ramp-major road clearance distance have a significant effect on the length of the bridge and the duration of the all-red clearance interval. An illustrative application of the model indicates that it can be used to develop relationships among SPUI design elements that yield the most cost-effective design.
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