为了探讨车型对城市道路并入型渐变段处交通流的影响，研究了大型车和小汽车在渐变段处并入主线的运动规律，以及对路段通行的影响。根据大小型车通过渐变段不同的加减速度以及排队规律，分析车辆通过渐变段影响区域的车均延误；根据不同大车率条件导致的通行能力差异，分析车辆通过渐变段影响区域的行程时间；建立了大型车和小汽车通过渐变段的延误模型和行程时间模型。以武汉市和平大道某并入型渐变段为例，利用 VISSIM 仿真平台验证延误模型和行程时间模型的有效性。结果表明，大车率的增加会对并入型渐变段的交通产生较大影响，使车辆的行程时间和平均延误增加。%In order to explore effects of vehicle types in the merging transition section in urban roads on traffic flow,the rules of movement of oversized vehicles and cars in the transition section merging to main road and its influence on the road capacity are studied.The average delay of vehicles when passing through the transition affecting area is analyzed based on different acceleration and decelera-tion speeds and the queuing rules of oversized vehicles and cars.The travel time of vehicles when passing through the transition affecting area is analyzed based on capacity differences caused by dif-ferent oversized vehicle conditions.The delay model and travel time model of oversized vehicles and cars passing through the transition section are established.The effectiveness of the two models is ver-ified with the help of VISSIM simulation platform by taking the merging transition section of Heping road in Wuhan city as an example.Results show that the increase of oversized vehicles will cause a influence on the merging transition section of the road,thus increasing the travel time and average delay of cars.
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