两相位交叉口左转车通行能力计算方法

Method of computing left-turn vehicle traffic capacity at two-phase intersection

针对传统的左转车通行能力计算方法中存在的问题,对无信号交叉口的可插车间隙理论模型进行了改进,建立了具有部分优先权的可插车间隙理论模型。通过实例对模型中的参数进行了标定,标定出具有部分优先权的左转车临界间隙为3.4 s,并代入模型计算出了左转车的通行能力,与传统模型相比,此模型的计算结果更符合实际,其平均相对误差为16.47%。

Aiming at the defects of the traditional method of computing the left-turn vehicle traffic capacity, the existing model for the gap acceptance at the intersection without traffic signal was improved and a new model was developed for the left-turning crossing the opposite through vehicles with limited priority. The proposed model was calibrated by the field data, resulting in that the critical gap of the left-turn vehicles is 3.4 s. The left-turn vehicle traffic capacity was computed with the gap. Compared with the traditional model, the proposed model appears closer to the reality, its average relative error is 16.47 %.