01031425

Component

https://doi.org/10.3141/1961-06

http://scholar.google.com...Wong&publication_year=2006

Left turns have a significant impact on the operation and performance of signalized intersections. Therefore, researchers have investigated alternative measures to improve the performance of intersections with heavy left-turn movements, some of which have been unconventional schemes. One of these schemes is the upstream signalized crossover (USC), a four-legged intersection designed to eliminate left-turn-opposing conflicts by crossing the left and through traffic to the left side of the road at all four approaches prior to the intersection. Crisscrossing action is achieved through the use of a secondary two-phase signal at each cross over point. This research investigated signal optimization strategies for USC intersections and identified important operation issues. The VISSIM microsimulation program was used to model and analyze the unconventional USC intersection and, for comparison, a conventional intersection. The analysis revealed that, for relatively balanced volumes, a USC intersection can significantly reduce average vehicle delays, particularly when the volumes entering the intersection are relatively high. More important, the capacity of the USC intersection was found to be approximately 50% greater than that of a conventional intersection with similar geometry under balanced traffic volumes. For highly unbalanced volumes, particularly when the intersection volumes were relatively low, a conventional intersection outperformed the USC intersection. Overall, the USC intersection showed considerable potential for situations in which one or more of the following conditions exist: (a) intersection volumes are balanced and near or over the capacity of a conventional intersection, (b) traffic volumes are somewhat unbalanced, but the overall entering volumes are too high to be accommodated with a conventional intersection, or (c) the intersection has heavy left-turn volumes that cause excessive delays.

01033942

English

pp 44-54

2006

Transportation Research Record: Journal of the Transportation Research Board

0309099706

Print

Figures (12) ; References (6) ; Tables (1)

Highway capacity; Highway traffic control systems; Left turns; Optimization; Signalized intersections; Traffic delays; Traffic flow; Traffic signal control systems; Traffic volume

VISSIM (Computer model)

Upstream signalized crossovers; Upstream traffic

Design; Highways; Operations and Traffic Management; Safety and Human Factors; I20: Design and Planning of Transport Infrastructure; I73: Traffic Control; I82: Accidents and Transport Infrastructure

TRIS, TRB, ATRI

Mar 3 2006 10:15AM

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