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在实测数据的基础上,以VISSIM为仿真平台,建立长大上坡路段仿真模型,分别以交通量、大车混入率、坡度、坡长为参数对长上坡路段的通行能力和车辆运行安全进行仿真试验。仿真结果显示:通行能力随着交通量的增加先增加,至道路饱和状态后,开始减少;随大车混入率的增加,通行能力呈下降趋势;通行能力随着道路坡度的增加明显呈下降趋势;坡长对通行能力的影响与坡度密切相关。冲突率作为长上坡路段交通安全评价指标,随着交通量的增加呈先增加后降低的趋势;随着大车混入率增加,冲突率先增加后减少,混入率为40%时交通冲突率达到峰值;随着坡度和坡长的增加,交通冲突率呈上升趋势,并且增长率越来越大。
On the basis of the measured data and the VISSIM simulation platform, the simulation model of the ascending section is established, and the traffic capacity, the mixed ratio of the cart, the slope and the length of the slope are taken as the parameters to simulate the traffic capacity and the vehicle running safety test. The simulation results show that traffic capacity first increases with the increase of traffic volume, and then decreases with the increase of traffic volume. Traffic capacity decreases with the increase of vehicle mix ratio; traffic capacity decreases with the increase of road gradient The effect of slope length on capacity is closely related to slope. Conflict rate, as an indicator of traffic safety in long uphill section, firstly increases and then decreases with the increase of traffic volume. With the increase of car blending rate, the conflict rate first increases and then decreases, and the traffic conflict rate reaches the peak when the mixing ratio is 40% With the increase of slope and slope length, the traffic conflict rate is on the rise and the growth rate is increasing.