Shared left-turn lanes which serve for both through and left-turn vehicles, are typically installed and operated under permitted phase with an adjacent pedestrian crosswalk in Japan. Because left-turn vehicles have to decelerate and often yield to crossing pedestrians, the queue discharge on such a lane tends to be disturbed. However, previous studies have only focused on the estimation of the expected capacity, without paying attention to the impacts of its variations on performance. Therefore, this study addresses the random nature of the shared left-turn lane. We developed a Monte Carlo simulation that can reproduce the departure of vehicles in shared left-turn lanes, while also considering the impact of pedestrian blockages, and the random order of left-turn and through vehicles, then computed the performance indices such as the number of departures per cycle, delays, and occurrence of oversaturation. The results exhibited that although demand does not exceed the capacity in terms of their average, the random nature in the shared left-turn lane sometimes causes severe oversaturation, which cannot be anticipated by current performance evaluation methods. That provides important insights for intersection layouts and controls, and shows the necessity of the real-time intelligent signal control scheme.
Random Nature of Shared Left-turn Lanes at Signalized Intersections
2020-09-20
316093 byte
Conference paper
Electronic Resource
English
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