处于不同目的的旅客对交通工具有不同的要求。例如，因公出差的旅客希望在旅途中的时间尽可能的短，出门旅游的游客则期望旅费尽可能省，而老年旅客则要求中转次数最少。编制一个全国城市间的交通咨询程序，为旅客提供两种或三种最优决策的交通咨询。(Passengers in different purposes have different requirements for the means of transportation. For example, passengers traveling on business want to travel as short as possible, while traveling tourists expect that they can save as much as possible, while older passengers require minimum number of transfers. A national urban traffic consultation process is developed to provide passengers with two or three optimal decisions on traffic consultation.)