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基于概率模型的具有短车道的信号交叉口进口道通行能力研究

, PP. 124-131

Keywords: 交通工程,通行能力,概率模型,短车道,进口道

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Abstract:

分析了短车道效应对进口道拓宽车道通行能力的影响,基于交通流理论和概率论,提出了考虑短车道排队阻塞情况下的信号交叉口进口道通行能力计算模型。该模型根据进口道中3种转向车流的比例、短车道几何特征以及信号周期计算一个信号周期中两种不同短车效应的发生概率,并计算各自情况下的进口道通行能力。进一步探讨了该模型中转弯车辆比例、短车道长度、信号周期长度、绿信比的变化对通行能力的影响。研究发现短车道对通行能力的主要影响因素包括左转车比例、短车道长度和绿信比,且当左转车比例在50%左右时,增加短车道长度能显著提高通行能力。此外,使用西安和上海的实测数据对本模型和HCM2000通行能力模型进行验证和对比,本模型的计算结果比HCM2000模型更加精确,误差小于200pcu/h。

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