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

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.