Operational Performance Comparison of Four Unconventional Intersection Designs Using Micro-Simulation

This article reports on a study that evaluated and compared the operational performance of four unconventional intersection schemes: the crossover displaced left-turn (XDL), the upstream signalized crossover (USC), the double crossover intersection (DXI) (i.e., half USC), and the median U-turn (MUT). The authors used micro-simulation software vissim (PTV Planung Transport Verkehr AG, Karlsruhe, Germany) to model and analyze the four unconventional intersections as well as a counterpart conventional one. They note that unconventional intersection designs are often suggested as strategies to reduce congestion at heavily congested at-grade signalized intersections. While many of the unconventional designs have been shown to outperform conventional intersections, they have not been compared to each other under different traffic volume conditions. The authors found that the XDL intersection constantly exhibited the lowest delays at nearly all tested balanced and unbalanced volume levels. The operational performance of both the USC and the DXI was similar in most volume conditions. The MUT design, on the other hand, was unable to accommodate high approach volumes and heavy left-turn traffic. The capacity of the XDL intersection was found to be 99% higher than that of the conventional intersection, whereas the capacity of the USC and the DXI intersections was about 50% higher than that of the conventional intersection. The authors conclude that their findings can be used to assist traffic managers and designers who need to choose among alternative unconventional designs according to the prevailing traffic conditions at an intersection.


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  • Accession Number: 01496517
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Sep 5 2013 4:51PM