Calculation model of maximum travel distance on urban road
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摘要: 为了合理体现交通事故延误对出行者路径选择的影响, 提出了随机状态下的交通事故时间延误模型。将交通事故的随机性、持续时间和道路通行能力等不确定性因素引入到交通分配模型中, 并对路径选择模型进行修正。分析了各等级道路最大适宜出行范围, 根据修正的路径选择模型, 采用逐次交通分配方法, 得到各等级道路的出行周转量和出行距离, 并与不考虑交通事故延误时的出行距离进行了对比分析。分析结果表明: 当考虑交通事故延误时, 支路、次干路、主干路、快速路的最大出行距离分别为2.000、2.946、4.054、5.963 km; 当不考虑交通事故延误时, 支路、次干路、主干路、快速路的最大出行距离分别为2.000、3.000、6.000、10.000 km; 交通事故延误是影响出行者路径选择的重要因素; 当考虑交通事故延误时, 高等级道路的最大出行距离变小。相比于传统的路径选择模型, 本文模型更优。Abstract: In order to reflect the influence of traffic accident delay on route choice for traveler reasonably, traffic accident delay model under random state was put out.The uncertain factors of traffic accident such as randomness, duration and road capacity were introduced into traffic assignment model, and the route choice model was modified.The maximum preponderant travel range of each grade road was analyzed.According to the modified route choice model, successive traffic assignment method was adopted.The turnovers and travel distances of all grade roads were got, and the travel distances were compared with the travel distances while traffic accident delay was not considered.Analysis result shows that while traffic accident delay is considered, the maximum travel distances of brunch, secondary primary road, main road and expressway are 2.000, 2.946, 4.054 and 5.963 km respectively.While traffic accident delay is not considered, the maximum distances of those roads are 2.000, 3.000, 6.000 and 10.000 km respectively.Traffic accident delay is the significant factor for traveler route choice.While traffic accident delay is considered, the maximum travel distances of higher grade roads decrease.Compared with the conventional route choice models, the proposed model is better.
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表 1 道路通行能力系数
Table 1. Road capacity coefficients
单方向车道数量 堵塞的车道数量 1 2 3 2 0.35 0.00 3 0.49 0.17 0.00 4 0.58 0.25 0.13 
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表 2 工况1出行周转量
Table 2. Travel turnovers of condition 1 pcu·km·h-1
道路等级 支路 次干路 主干路 快速路 路网 点A1与点A2路网范围 点A1至点A2 2 000 点B1与点B2路网范围 点B1至节点1 250 节点1至节点16 452 2 048 节点16至点B2 250 点F1与点F2路网范围 点F1至节点2 375 节点2至节点36 2 196 4 054 节点36至点F2 375 节点3与节点64路网范围 节点3至节点64 1 427 2 610 5 963
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表 3 工况1总出行周转量
Table 3. Total travel turnovers of condition 1 pcu·km·h-1
道路等级 支路 次干路 主干路 快速路 路网 点A1与点A2路网范围 2 000 点B1与点B2路网范围 452 2 548 点F1与点F2路网范围 2 946 4 054 节点3与节点64路网范围 1 427 2 610 5 963
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表 4 工况1出行距离
Table 4. Travel distances of condition 1 km
道路等级 支路 次干路 主干路 快速路 路网 点A1与点A2路网范围 2.000 点B1与点B2路网范围 0.452 2.548 点F1与点F2路网范围 2.946 4.054 节点3与节点64路网范围 1.427 2.610 5.963 最大出行距离 2.000 2.946 4.054 5.963
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表 5 工况2总出行周转量
Table 5. Total travel turnovers of condition 2 pcu·km·h-1
道路等级 支路 次干路 主干路 快速路 路网 点A1与点A2路网范围 2 000 点B1与点B2路网范围 3 000 点F1与点F2路网范围 1 000 6 000 节点3与节点64路网范围 10 000
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表 6 工况2出行距离
Table 6. Travel distances of condition 2 km
道路等级 支路 次干路 主干路 快速路 路网 点A1与点A2路网范围 2.000 点B1与点B2路网范围 3.000 点F1与点F2路网范围 1.000 6.000 节点3与节点64路网范围 10.000 最大出行距离 2.000 3.000 6.000 10.000
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