1·With the rapid development of city economic and citifying course. the tendency of the increasing quantity of motor vehicle will lead to traffic flow uprising, traffic congest, and traffic jam.
随着城市经济的快速增长和城市化进程的加快，城市机动车数量呈快速增长的势头必然会造成道路交通流量猛增，交通拥挤和堵塞。
2·Finally, spatial temporal speed figure was introduced to help find the headstream of congest.
介绍了用时空速度变化图寻找拥挤源头以及选择交通控制措施的方法。