Legal basis: Road Traffic Safety Law of the People's Republic of China.
Article 39 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 traffic and prohibiting traffic for motor vehicles, non-motor vehicles and 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.
Fifty-fourth highway maintenance vehicles and engineering vehicles shall not affect the passage of passing vehicles, and the driving route and direction are not restricted by traffic signs and markings. Passing vehicles and personnel should pay attention to avoid them.
Sprinklers, sweepers and other motor vehicles shall operate in accordance with safety operation standards; Under the condition of not affecting the traffic of other vehicles, you can not be restricted by lane separation, but you can not drive in the opposite direction.