According to the inquiry of Life Information Network, Langfang began to limit the number from 20 14. 20 14 is due to the increasingly serious traffic congestion in Langfang city. In order to reduce traffic pressure and improve traffic conditions, Langfang municipal government decided to implement measures to limit the number of vehicles. The implementation of vehicle number limit measures can effectively control the number of vehicles and reduce the occurrence of traffic congestion. This can not only improve traffic efficiency, but also reduce air pollution and traffic accidents.