A Study of Exclusive Pedestrian Phase Optimization Based on Minimizing Vehicle and Pedestrian Delays
Date Issued
2015
Date
2015
Author(s)
Kuo, Yu-Hung
Abstract
As humanity-oriented transportation becoming a main stream in recent years, instead of considering only motorized transport modes, it emphasizes on humanized transport environment. We shall attach importance on the safety of road users, including providing a friendly-used environment for pedestrian and bicycles in order to achieve equally right-of-way environment. If there are too many conflicts between turning vehicles and pedestrian, we could use signal control to separate entirely movements between vehicles and pedestrian to maintain the safety. As a consequence, pedestrian can cross the intersection in all directions with exclusive phase which means exclusive pedestrian phase. To avoid the impact of exclusive pedestrian phase, pedestrian crossing time is calculated by minimum green time, which means it only allows pedestrians who stand on the sidewalks and wait for crossing without considering pedestrian flow and pedestrian performance, failing to achieve equally right-of-way as well. Our research collects and analyzes pedestrian flow data under intersections with exclusive pedestrian phase in order to establish pedestrian crossing time with multiple regression model, and estimate pedestrian start-delay value and buffer interval. Developing a signal timing optimization model which is based on minimizing vehicle and pedestrian delays is applied to exclusive pedestrian phase with considering the pedestrian flow that collected by field observation. The optimization model is adopted group-based method, breaking the phases into vehicular movements and pedestrian movement, building a conflict matrix of the junction, and considering the relationship among point of time, effective green time and lost time. Four-legged intersection and T intersection are designed and solved by the model. The outputs would be starting point and ending point of every movement, cycle length, average pedestrian delay and average vehicle delay. Our research also assesses the possibility of implementing both protected left-turn phasing and exclusive pedestrian phase under four-legged intersection. Based on the cycle length solved by optimization model, construct the feasible sets of traffic flow of major road and minor road. Finally, our research selects two types of intersections with exclusive pedestrian phase in Taipei City as case studies to compare and analyze the performance of signal timing between the original one and optimization model. Our research developed signal timing for optimization model with lower delay time for both vehicles and pedestrians, which performance is better than those of the previous signal timing plan.
Subjects
Exclusive pedestrian phase
Pedestrian Signal
Signal timing optimization
Stream-Conflict Matrix
SDGs
Type
thesis
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