Spacing calculation and selection on opposite vehicle access of large public building
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摘要: 为降低交通事故率, 参考出入口管理策略, 分析大型公建对向机动车出入口特征, 以消除间距不足引发的冲突点为优化目标, 根据微观交通流理论, 建立对向出入口最小间距模型, 给出避开交叉口功能区的最大间距, 构成间距范围。结合交通仿真与熵权法, 利用基于交通冲突技术的逼近理想解排序法, 对间距候选方案进行安全评价, 得出最优间距, 并以某大型公建区域为例进行计算及优选。计算结果表明: 该区域对向出入口间距范围为83.98~278.76 m, 最优间距为120.73 m, 对应最优解贴近度为0.5182, 间距值位于间距范围内时, 存在最大贴近度。Abstract: To reduce crash rate, the access management(AM)strategy was considered, and opposite vehicle access features of large public buildings were analyzed.A minimum opposite access spacing model was established based on microscopic traffic flow theory, and its optimization objective was to eliminate conflicts due to inadequate spacing.The maximum spacing was deduced to keep access from the functional area of intersections, and a spacing range was formed, traffic simulation and entropy weight method were utilized, and the technique for order preference by similarity to ideal solution(TOPSIS)based on traffic conflict techniques was proposed to evaluate the spacing schemes and search the optimal spacing from several spacing values.A large public building area was taken as an example for spacing calculation and selection.Calculation result indicates that the range of opposite access spacing is 83.98~278.76 m, its optimum spacing is 120.73 m, and the closeness degree of optimal solution is 0.518 2.When spacing value is in the range, there is a miximum value of closeness degree.
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Key words:
- traffic planning /
- access spacing /
- access management /
- traffic conflict technique /
- TOPSIS /
- large public building
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表 1 对向出入口最小间距
Table 1. Minimum spacings of opposite-side access
W/m V/(km·h-1) ain/(m·s-2) aout/(m·s-2) Ldx/m 6.0 20 0.6 0.8 36.46 7.0 30 1.2 1.4 43.44 7.5 40 1.8 2.0 54.06 8.0 50 2.4 2.6 65.41 8.0 60 3.0 3.2 77.82 
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