Legal analysis: during the epidemic, it is necessary to obtain the approval of the higher authorities before closing the door and closing the road. If not, it is illegal to close the door and close the road without permission. The Ministry of Public Security has also issued a statement that illegal acts such as setting up checkpoints and blocking traffic without approval should be reported to the party committee and government immediately, and handled safely according to law to maintain normal traffic order. When Class A and Class B infectious diseases break out and become popular, the local people's governments at or above the county level may, upon the decision of the people's government at the next higher level, declare part or all of their administrative areas as epidemic areas; The State Council can decide and publish epidemic areas across provinces, autonomous regions and municipalities directly under the Central Government. The local people's governments at or above the county level in the epidemic area may take emergency measures as stipulated in Article 42 of this Law, and may carry out health quarantine on people, materials and means of transport entering or leaving the epidemic area.

Legal basis: People's Republic of China (PRC) Law on the Prevention and Control of Infectious Diseases.

Article 41 The local people's governments at or above the county level may take isolation measures against the persons in the places where cases of Class A infectious diseases occur or in specific areas within the places, and report to the people's governments at the next higher level at the same time; The people's government at a higher level that receives the report shall immediately make a decision on approval or disapproval. If the people's government at a higher level makes a decision not to approve, the people's government that implements the isolation measures shall immediately lift the isolation measures.

Article 43 When Class A and Class B infectious diseases break out and become epidemic, the local people's governments at or above the county level may, upon the decision of the people's government at the next higher level, declare part or all of their administrative areas as epidemic areas; The State Council can decide and publish epidemic areas across provinces, autonomous regions and municipalities directly under the Central Government. The local people's governments at or above the county level in the epidemic area may take emergency measures as stipulated in Article 42 of this Law, and may carry out health quarantine on people, materials and means of transport entering or leaving the epidemic area.