As of 17:00 on November 29, 2022, Cangzhou *** there are 116 high-risk areas, the outbreak is more serious, if passing through Cangzhou for more than four hours, then you need to report to the community to listen to the community arrangements to see whether to do nucleic acid or quarantine after arriving at the destination.

When a passenger's transit time exceeds four hours, the trip code becomes asterisked. When a passenger stays in a medium- to high-risk area for more than four hours or more during a trip, communications big data will record the passenger's pathway and visits during that time, resulting in changes to the individual's health code and itinerary code.