There are many kinds of vehicle restrictions. Some are on a certain road section, some are on a certain period of time, and some are on a certain vehicle type. For example, recently Beijing has stipulated that the vehicle license plate number is used for single and double travel restrictions. For example, the tail number restriction was adopted before the Beijing Olympic Games to ensure smooth traffic and air quality. Now it has become a long-term policy. One is to reduce the traffic burden caused by the rapid growth of vehicles in Beijing, and the other is to reduce the emission of motor vehicle exhaust in Beijing, so as to control the air pollution index in Beijing within a reasonable range.
