The BPR model was used to release the law between the characters of parking vehicle and speed of the main road. This paper focuses on the rightmost lane on the main road at the sections of off-street parking access in the city. An impedance function model describing the off-street parking vehicle enters or not was established through the analysis of theory and specific cases based on parameters. Some conclusions can been drawn as follows:firstly, speed of the rightmost vehicle is only related to its flow and proportion of the lane been utilized is only 0.384, while there is no off-street parking vehicle; secondly, speed of the rightmost vehicle is related to the influence time, frequency of parking, deceleration distance and its flow , while the off-street parking vehicle entry into the access . Meanwhile, sensitivity analysis of influence of relative factor on the speed of the social vehicles was conducted. Results show that the parking vehicle's deceleration distance is contrast to the average speed and it's influence time is in proportion to the average speed, while the off-street parking vehicle affected the vehicles on the rightmost lane. Moreover, the social vehicles would be deeply affected by the off-street parking vehicle, while the deceleration distance is less than 10 m.%为寻找停放车辆的驶入特征与主路车流速度之间的变化规律,以路阻函数(BPR)模型为理论基础,以城市路外停车场出入口接入主路的最右侧车道为研究对象,通过实测数据分析,建立了无停车驶入时出入口影响区范围内该车道的路阻函数模型及停车驶入后对该车道的影响模型.研究结果表明,当无停车驶入时,最右侧车道的车流速度仅与本车道流量密切相关,且该车道的利用系数仅为0.384;当有停车驶入时,最右侧车道的车流速度与停放车辆的驶入频率、驶入影响时间、减速距离及本车道流量等参数密切相关.通过对影响模型的各个参数进一步进行敏感性分析发现:受停车影响后的社会车辆的平均车速与停放车辆的减速距离呈现反比关系,与停放车辆的驶入影响时间呈现正比关系;当减速距离小于10 m时,社会车辆的速度受停车驶入影响变化幅度大.
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