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Guidelines for the Design of Urban Arterial Interchanges in Densely Developed Areas
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1992-02-01
[PDF-3.08 MB]
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Edition:Final Report: July 1991 - February 1992
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Abstract:This research report documents guidelines for the design of urban arterial interchanges in densely developed areas. It addresses the geometric issues, operational issues, benefits, and costs of three interchange configurations. The configurations investigated are the Tight Urban Diamond Interchange (TUDI), the Single Point Urban Interchange (SPUI), and the Left-Hand Exit Single Signal (LHESS). Despite the geometric differences between the TUDI and SPUI, they both require virtually the same amount of right of way. This contradicts the popular belief that the SPUI configuration minimizes right-of-way requirements. The LHESS configuration can be constructed within a narrower right-of-way due to the reduced control area. The SPUI operational characteristics were found to be dependent on the relative proportion of simultaneous left turning volumes. By contrast, the TUDI was found to be efficient under a variety of demand volumes. The LHESS operated similar to an at-grade intersection. In general, the TUDI was found to be the best design alternative under urban conditions. It offers the greatest flexibility in operation and future expansion at a lower cost than the SPUI. The LHESS design is not recommended due to its violation of driver expectancy. A case study of two intersections in the state of Texas was performed to illustrate the application of the material presented in this report.
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