山区高速公路紧急避险车道辅助车道设置

Auxiliary Lane for Truck Escape Ramp on Expressways in Mountainous Areas

摘要:

通过对8处紧急避险车道主线外侧车道车头时距的收集与分析,运用拟合分析和卡方检验，发现当外侧车道交通流小于500 veh?h-1时，车头时距符合负指数分布.考虑主线外侧车道交通流量、失控车辆的速度与失控车辆汇入的临界间隙，应用微分法求导得到失控车辆汇入主线外侧车道的汇入概率模型.通过分析失控车辆汇入主线外侧车道的换车道驾驶行为，得到了不同路面状况下车辆汇入临界间隙.在保证失控车辆95%的汇入成功率条件下，计算不同路面状况、主线外侧交通流量与驶入速度下的辅助车道长度设置值.

关键词:道路工程; 辅助车道; 汇入模型; 紧急避险车道; 车头时距; 驾驶行为

Abstract:

Based on the headway collection and analysis on the expressway of 8 driving lanes where a truck escape ramp(TER) is constructed, a fitting analysis and a chisquare test were conducted. The results show that the headway is an exponential distribution when the traffic flow of the driving lane on the expressway is no more than 500veh/h. Considering the traffic flow on the driving lane, and the operation speed of errant vehicles and critical headway, a vehicle merging model was proposed using the differential method. The critical headway was obtained under various road conditions through analysis of the changing lane behavior of errant vehicles. Then in the condition of 95% confidence interval of errant vehicles merged in the driving lane of the expressway, the required design length of the auxiliary lane was calculated under different road conditions, traffic flow of outside lane on expressway, and the operation speed of errant vehicles.

Key words:road engineering; auxiliary lane; merging model; truck escape ramp; headway; driving behavior