作者简介:潘福全(1976—),青岛理工大学教授.研究方向:公共交通与交通安全.E-mail:fuquanpan@yeah.net
中文责编:英 子; 英文责编:淡 紫
DOI: 10.3724/SP.J.1249.2020.02143
当前中国城市内大量封闭社区使车辆行驶时不得不绕行,造成时间和人力等的浪费.通过剔除插入后不影响最短路径值的中间节点改进Floyd算法,并将该算法运用于开放街区内部道路资源后的车辆行驶最优路径求解问题.以中国青岛市西海岸新区中央商务区的外卖送餐车辆行驶路径为研究对象,调查路网现状、外卖送餐的车辆路径分布以及起讫点(origin-destination, OD)分布.基于最短路理论条件下拟定小区开放后的公共道路,利用改进的Floyd算法设计出最优送餐车辆行驶路径,对比街区开放前后的送餐车辆行驶时间.结果表明,在小区开放条件下,优化路径后的外卖送餐车辆行驶时间变短,准确性和效率明显得到提升.说明开放街区可以实现道路资源的共享,提升周边道路通行能力,提高直达性,缓解周边的交通压力,节省了社会资源.
Because of the existence of a large number of closed blocks in currently China cities, vehicles have to bypass when they are driven, which causes a huge waste of time, manpower and so on. In order to study the optimal vehicle driving route under the policy of open blocks, the optimal route algorithm which is suitable for takeout delivery is analyzed, and the Floyd algorithm is improved by eliminating the intermediate nodes which do not affect the shortest path value after insertion. By considering takeout delivery vehicles which move on the West Coast New Area of Qingdao as research object, current situation of the road network, distribution of the route of the vehicle driving and distribution of the orgin-destination(OD)point are measured. On the basis of the shortest path theory, the public road after opening of blocks is drawn up, and the optimal path to delivery vehicle driving is designed by using the improved Floyd algorithm. The time of takeout delivery vehicle driving under path optimization is calculated, and compared with the time used in the current situation. The results show that the driving time of vehicles for takeout delivery becomes shorter, the accuracy and efficiency are obviously improved after opening of the community. The results show that open blocks can realize sharing of road resources, enhance the capacity of surrounding roads, improve the directivity, relieve the traffic pressure around, and save social resources.