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通过对交通事故下城市快速路局部通行状态的演变过程分解和影响因素分析,构建了基于VISSIM仿真的城市快速路事故路段通行能力估算方法。该方法引入决策树ID算法,利用信息增益值求解事故延迟时间,以车流波动理论为基础,确定了事故拥挤消散时间。以事故延迟时间为观测周期,单位时间内通过的最大车辆数为事故路段的通行能力,运用VISSIM仿真软件,对其进行仿真计算。仿真结果表明:车辆抛锚的事故延迟时间与拥挤消散时间最小,事故路段剩余通行能力最大,为3 776 pcu/h,其比例为69.926%;车辆起火、车辆追尾、车辆翻车的剩余通行能力为3 327,3 229,3 071 pcu/h,其比例分别为61.611%,59.796%,56.870%;车辆碰撞的事故延迟时间与拥挤消散时间最大,事故路段剩余通行能力最小,为2 698 pcu/h,其比例为49.963%;不同的事故类型,其拥挤消散时间与事故延迟时间之间的比值和事故路段的剩余通行能力有关,事故路段剩余通行能力越大,其比值就越小,反之就越大。
Through the analysis of the evolution process and the influencing factors of the local expressway under the traffic accident, the traffic capacity estimation method of urban expressway accident based on VISSIM is constructed. The method introduces the decision tree ID algorithm, and uses the information gain value to solve the accident delay time. Based on the flow fluctuation theory, the congestion congestion time is determined. Taking the accident delay time as the observation period, the maximum number of vehicles passed in a unit time is the traffic capacity of the accident section. VISSIM simulation software is used to simulate the traffic accident. Simulation results show that: the vehicle broke down accident delay and congestion dissipates minimum time, maximum road accidents remaining capacity, is 3 776 pcu / h, a ratio of 69.926%; vehicle fire, vehicle rear-end collision, the vehicle rollover remaining capacity of 3 327,3 229,3 071 pcu / h, respectively, in a proportion of 61.611%, 59.796%, 56.870%; collision accident of the vehicle and the congestion dissipates delay time to maximum, minimum residual capacity road accidents as 2 698 pcu / h, a proportion of 49.963%; different types of accidents that the remaining capacity ratio and the congestion road accidents between accident dissipation time delay, the greater the residual capacity road accidents, the smaller the ratio, the greater the contrary .