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This paper addresses an unconventional design for accommodating bus U-turns at signalized intersections based on a case study in Miami, Florida. Field data was collected at the study site, including traffic volumes, traffic conflicts, pedestrian/bicyclist activities, signal phase sequence, headway of buses, and radii of bus U-turns. A detailed operational analysis was performed at the signalized intersection using Synchro. The results of the operational analysis indicate that implementation of the unconventional bus U-turn design at the signalized intersection will not cause major operational problems when the total entering volume is less than 4,000 vehicles/hour. To address the safety concerns at the study intersection, both crash analysis and conflict analysis were conducted. A review of accident data for the subject intersection indicates that accidents related to the bus U-turn occur infrequently. The 8-hour conflicts analysis showed that very few conflicts were caused by bus U-turn movements.

An Unconventional Design for Bus U-Turns at Signalized Intersections