大道定理在城市主干路间距分析中的应用

摘要

Urban resident trip consist of the travel in urban residential community and the travel in road,and the average speed of travel in urban residential community is slower than that in road. Though traveling in road can save time,the time increase of intersection delay brought by dense read may affects,the total travel time. So,reasonable layout of urban read is the key to save urban resident＇s travel time. This paper builds an urban resident trip optimal time model combined with the optimal travel time and the restriction of investment on road of the turnpike theory, and calculates the optimal distance of urban road.%城市居民出行可以分为街区内和街区外的出行2部分，且街区内的平均出行速度往往比街区外的出行速度要低。居民出行为了缩短时间，要求城市中的干路网尽量的密，但是线路网过密，会引起因交叉口等待而造成延误时间增加．而达不到时间最优的效果。所以合理的设计、布局城市内的干路网络是缩短城市居民出行的关键。文章结合大道定理的出行时间最优和干路投资资金限制的思想，建立城市居民出行时间最优模型，并计算出城市干路网络的最优间距。