Signal Timing Strategy for Displaced Left Turn Intersections
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2020-08-01
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Edition:Final Report
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Abstract:Conventional intersection design has met the challenges of increasing congestion and traffic delays. To solve this problem, transportation planners and engineers have proposed a variety of innovative intersection designs. Among these innovative intersection designs, displaced left turn (DLT) intersection has been implemented in 12 states in the USA. Since DLT is relatively new and only implemented in a few states, there are few existing guidelines available for designing DLT intersections. One of the critical elements when designing a DLT intersection is the signal timing plan. An appropriate signal timing plan will maximize intersection capacity, reduce congestion, and improve safety. There are very limited existing studies on the signal timing design of DLT and the progression needs of vehicles have not been well considered in these studies. The purpose of this research is to develop a comprehensive signal timing strategy for DLT intersections. To achieve this purpose, the research team first reviews and summarizes current guidelines and research findings on how to design and optimize signal timing for DLT intersections. Then, a new DLT signal time design methodology is proposed by considering various traffic conditions. The proposed DLT signal timing is evaluated by microscopic simulation. The results are compared with the signal timing provided by an existing signal timing optimization tool named Synchro, and the results show that the developed signal timing outperforms the one generated by Synchro regarding the average delay, travel time, and queue length.
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