快速路交织区交通流模型研究

Research on Traffic Flow Model of Expressway Weaving Area

为了再现快速路交织区交通流的运行特性,在跟驰模型中引入交通压力,并采用驾驶人心理制约条件对车辆换道模型进行改进,将二者结合起来提出了新的快速路交织区交通流模型;应用Java语言编写程序,针对不同的交通状态进行模拟再现。仿真结果表明:当交通量一定时,直行车辆和交织车辆的平均速度都会随着交织区长度的增加而增大;交织区长度增加为交织车辆的交织运行提供了较大空间,随着交织区长度的增加,交通量略有增加,交织区长度的增加可以有效抵消交通量的增加对直行车辆的干扰;在交通量较小时,车辆速度随着交织区长度的变化较小,高流量时,交织区长度对平均速度的影响较大,当交织区长度小于150 m时,外侧直行车辆车速大于交织车辆的车速,随着交织区长度增加,交织车辆的速度接近于直行车辆的速度,当交织区长度大于350 m后,变化就不明显。

In order to reproduce the running characteristics of traffic flow of the expressway weaving area, the traffic pressure was considered in the vehicle-following model, psychological restrictive conditions of drivers were used to improve vehicle lane-changing model. Combining them, authors put forward the new traffic flow model of expressway weaving area. The Java language was applied to programming and simulated reproductions were carried out under different traffic conditions. The simulation results show that when the traffic volume is unchanged, the average speeds of straight through vehicles and weaving vehicles increase with the weaving area length. Along with the increase of weaving area length, the traffic volume increases slightly, but it provides larger space for running of the weaving vehicles. Increase of weaving area length can effectively counteract interruption effect on straight through vehicle due to increase of traffic volume. When traffic volume is small, variation of vehicle speed vs weaving area length is little. When traffic volume is big, influence of weaving area length on average speed is great. When weaving area length is smaller than 150 m, speed of lateral straight through vehicle is bigger than that of weaving vehicle. With increase of weaving length, speed of weaving vehicle approximates to that of straight through vehicle. When weaving area length is bigger than 350 m,variation of speed of straight through vehicle is not obvious.