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摘要: 针对非机动道路内电动自行车与传统自行车混合行驶的交通现象, 在分析混合自行车交通流特性的基础上引入Logistic模型, 利用数值分析方法建立了适用于描述混合自行车流量-密度关系的数学模型与自行车道通行能力计算模型, 利用杭州市6个路段的实测数据进行数据拟合, 得到了通行能力估计值, 对车流样本中的最大速度、自由流速度、最佳密度进行了参数敏感性分析。研究结果表明: 6个路段数据的拟合优度分别为0.92、0.93、0.93、0.95、0.98、0.96, 通行能力分别为2 968、2 641、2 687、2 754、2 646、3 065 bic·(h·m)-1, 因此, 模型能较好地描述城市混合自行车交通流在不同状态下的变化特征, 为进一步揭示城市自行车道内混合自行车交通流运行机理提供了新的思路。
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关键词:
- 城市道路交通 /
- 混合自行车交通流 /
- 电动自行车 /
- 流量-密度关系 /
- Logistic模型
Abstract: Aiming at the traffic phenomena of electric bicycle and traditional bicycle mixed driving on non-motorized road, logistic model was introduced based on the analysis of mixed bicycles'flow characteristic, the numerical analysis method was used to build the mathematical model, to suitably describe the flow-density relationship of mixed bicycles, and the calculation model of bicycle lanes'traffic capacity was proposed.The data fitting was carried out based on the field data of six road sections in Hangzhou, the estimation values of traffic capacity were obtained, and the parameter sensitivity analysis was carried out for the maximal speed in bicycle flow samples, the speed of freedom flow and the optimal density.Research result shows that the fitting goodnesses of the data of six road sections are 0.92, 0.93, 0.93, 0.95, 0.98 and 0.96 respectively, and traffic capacities are 2 968, 2 641, 2 687, 2 754, 2 646 and 3 065 bic·(h·m)-1respectively, so this model can well describe change the characteristics of urban mixed bicycle flow in different states, and it provides a new way to further uncover the operation mechanism of mixed bicycle flow in urban bicycle lane.-
Key words:
- urban road traffic /
- mixed bicycle flow /
- electric bicycle /
- flow-density relationship /
- Logistic model
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表 1 混合自行车流中电动自行车的比例范围
Table 1. Proportion ranges of electric bicycle in mixed bicycle traffic flow
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表 3 实测数据拟合结果及通行能力估计
Table 3. Fitting results of field data and estimation of traffic capacity
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