Legal basis: Article 39 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 traffic, restricting traffic and prohibiting pedestrians. In case of large-scale mass activities and large-scale construction, etc. If it is necessary to take measures to restrict traffic or make decisions directly related to public road traffic activities, it shall be announced to the public in advance.