高速公路加速车道设计理论探讨

An Application study of Merging Theory on Designing Acceleration Lane for Expressway

提出了以高速公路加速车道合流等待理论为基础的加速车道长度设计方法和以排队论为基础的入口匝道交通控制方法。这些方法克服了传统方法中忽视主线交通量的情况，特别是在主线较为拥挤的条件下加速车道上排队的情况。

It is obviously irrational that the design of onramp acceleration lane for expressway is only taken account of motor dynamic characteristics.This paper presents a new design philosophy on acceleration lane that the traffic volumes on main line of expressway and onramp are considered in the computation of the acceleration lane length.The methodologies are based on the merging and queuing theories of probability.The methods are especially proper for the condition of congested traffic on main line of expressway.A group of computer simulated designing lengths of acceleration lane are also provided in this paper for the purpose of comparison between various methods and the traditional design standards.Finally the onramp metering is also concerned according to the queuing theory and the threshold value inequality is given for the better control to the onramp traffic.