| Summary: | 碩士 === 淡江大學 === 運輸管理學系碩士班 === 99 === Nowadays, we focus on the safety of pedestrians that often caused casualties by conflicts between pedestrians and cars in intersections. There are many different ways to separate cars and pedestrians in intersections by the traffic signal. For instance, Exclusive Pedestrian Phase is a way to separate cars and pedestrians, but it often caused more delay in intersections.
In this study, Leading pedestrian interval (LPI) as the starting point. We try to make part of the pedestrian flow safely through the conflict zone and take vehicles into account for the efficiency of vehicles.
We also use pedestrian diffusion methodology to estimate how many pedestrians on the conflict zone in every seconds of the signal phase, so we could know the number of conflicted pedestrians.
In the case studies, the cost of LPI is lower than Exclusive Pedestrian Phase when there were less than 1000 pedestrians per hour on the crosswalk. If the traffic is close to the road capacity, it’s not suitable for long length LPI or Exclusive Pedestrian Phase. We recommended a shorter LPI length for pedestrian safety.
When right turning ratio is less than 0.3, the LPI operating costs will be lower than Exclusive Pedestrian Phase. When the right turning ratio greater than 0.3, the right turn vehicles will be a serious conflict with the pedestrian flow, making the higher costs of conflict and vehicles, pedestrian phase due to down the cost of vehicle conflict, it is applicable to this situation.
In the multi-lane environment, if the right turning ratio less than 0.4, we suggested to use exclusive right turning lanes and the exclusive right turning signal phase for LPI control to reduce unnecessary travel delay of vehicles that go straight.
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