考虑服务交通量的加速车道长度设置方法

The Length Design Method for Acceleration Lane Taking into Account of Traffic

高速公路加速车道的设置长度不仅取决于主路及匝道的设计速度,还与主路及匝道的交通量有关。本文给出了不同主路服务交通量下的匝道通行能力,建立了在主路不同交通负荷下的匝道车辆可直接汇入的概率计算模型。最后给出了在一定的匝道车辆汇入概率和主路服务交通量下的加速车道长度设置方法,以及不同主路、匝道设计速度和服务交通量下的加速车道长度的推荐值。

The length design of the acceleration lane depends on not only traffic speed but also traffic volume of the main line and ramp of expressway interchanges.The ramp capacity under different traffic flow of the main ling is presented,and the merging probability model of the vehicle on the ramp under different flow volume of the main line.The length design method of the acceleration lane is presented,taking into account of certain merging probability of the vehicle on the ramp and the traffic flow of the main line.The values of the length of the acceleration lane are then put forward.