Impact of Upstream Weaving Segment on Signalized Intersection Capacity

Signalized intersections with weaving segment upstream are very common on urban roads. Weaving segment determines the arrival rate of the approach, and the operational condition of itself is affected by the approach queue accumulated at the same time. According to the character of arrival and departure of vehicles, the impact of weaving segment on the signalized intersections capacity is analyzed qualitatively and quantitatively. Based on the analysis of ideal arrival rate, the model of lane group´s capacity is established, which is also validated with simulation. Then, the study on the factors and its sensitivity analysis about the impact on the capacity due to the weaving segment has been conducted. According to the study, the length of weaving segment and approach play the dominant role, and in order to improve the capacity of approach lengthening the weaving segment is more important. And there exists an optimum signal cycle to the capacity.