提前右转机动车的通行能力

以可插车间隙理论和概率论知识为基础,对提前右转两种组织方式下右转机动车的理论通行能力进行了对比研究,建立了设置交织区所能增加右转机动车通行能力的计算模型,并且以平均延误为指标对比分析了两种组织方式的运行效果。在实行右转机动车提前右转的交叉口,如果只允许右转机动车在某一点处穿越非机动车流进入渠化开辟的右转机动车专用车道,就能够满足通行能力时,则采用该种组织方式。当出现右转机动车通行能力不足时,可以通过延长交织区长度来增加通行能力,减少右转车的平均延误。延长交织区长度虽然增加了冲突区面积,但是可以解决一些实际问题。

Passing Capacity of Advance Right-Turn Motor Vehicles

On the basis of the theories of gap acceptance and probability, the theoretical passing capacity of the advance right-turn vehicles under two planning approaches was investigated. A mathematic model for using interweaving area to enhance the passing capacity of the advance right-turn vehicles was proposed. By this model, the running efficiency of the two planning approaches was compared where the average delays were taken as the assessment index. In a junction where motor vehicles were allowed right-turn in advance, the first approach was applied if it meets the demand of right-turn motor vehicle capacity; otherwise prolonging the interweaving area to increase the passing capacity was adopted to reduce the average delay of the right-turn vehicles. Prolonging the interweaving area is an applicable approach to solve practical problem although it enlarges the conflict zone.