大型公建机动车出入口下游功能区面积计算

Size Calculation for Vehicle Access Downstream Functional Area of Large Public Building

为定量化大型公建机动车出入口交通影响范围,假设出入口右转交通冲突区为其下游功能区,分析出入口下游功能区面积的交通影响特征.进而以交通冲突时后随右转车位置为右转冲突分布点,给出基于摄影测量法的出入口右转冲突分布点实际坐标公式,以测量右转冲突区域.然后通过右转冲突坐标点曲线拟合,界定右转冲突区端点,从而确定出入口下游功能区面积模型.最后以某大型公建机动车出入口为例,进行成果试算及仿真验证.验证结果表明,出入口下游功能区内城市道路交通延误较大,且延误数值存在先急剧增大后缓慢减小的变化态势,吻合了右转冲突区域的形状和面积特征.因而基于右转冲突区域形状的出入口功能区面积模型可界定大型公建出入口影响范围,有助于城市道路微观交通组织优化.

To quantify the vehicle access traffic impact area of large public buildings, assuming access rightturn traffic conflict area as its downstream functional area, traffic impact characteristics of access downstream functional area size are analyzed. Further, with following right- turn vehicle location in traffic conflicts taken as the right- turn conflict distribution point, access right- turn conflict distribution point real coordinate formulas based on the photogrammetry method are proposed, in order to measure the right- turn conflict area. Then through curve fitting right- turn conflict coordinate points, boundary points of right- turn conflict area are defined, so that the access downstream functional area size model is determined. Finally,one large public building vehicle access is taken as an example for result trial calculation and simulation validation. Verification results show that, urban street traffic delay in the access downstream functional area has the large value, and delay values have rapid increase and slow decrease changing states successively,which fits the right- turn conflict area shape and size features. Therefore access functional area size model based on the right-turn conflict area shape could define the large public building access impact area, which is good for urban street microscopic traffic organization optimization.