There is no fixed time for high-speed traffic control. Express traffic control means that there are too many things on the express car, and the traffic police stop to check them one by one to prevent dangerous goods from entering the country. Traffic control is a specific regulation of guiding, prohibiting, restricting or instructing the traffic of vehicles and pedestrians on the road and other traffic-related activities formulated by the traffic management department of the public security organ according to laws and regulations. After the implementation of traffic control, citizens should abide by the control notice and actively cooperate with the traffic police department.

According to the provisions of Article 39, paragraph 1 and Article 40 of the Road Traffic Safety Law of the People's Republic of China, the traffic administrative department of the public security organ may, according to the specific conditions of roads and traffic flows, take measures such as diverting, restricting and prohibiting the passage of motor vehicles, non-motor vehicles and pedestrians; In case of natural disasters, bad weather conditions or major traffic accidents that seriously affect traffic safety, it is difficult to ensure traffic safety by taking other measures, and the traffic management department of the public security organ may implement traffic control.

According to Article 49 of the Emergency Response Law of People's Republic of China (PRC), "After a natural disaster, accident disaster or public health incident occurs, the people's government performing unified leadership duties may take one or more of the following emergency measures: (2) quickly control the hazard sources, delimit dangerous areas, block dangerous places, delimit warning areas, and implement traffic control and other control measures;" According to the regulations, traffic control measures can also be taken after accidents, disasters or public health incidents.

According to Article 42 of the Law on the Prevention and Control of Infectious Diseases in People's Republic of China (PRC), when an infectious disease breaks out, the local people's government at or above the county level may take five emergency measures, such as restricting or stopping fairs, theater performances or other crowd gathering activities, and closing places that may cause the spread of infectious diseases, and may carry out health quarantine on people, materials and means of transportation entering and leaving the epidemic area.