What is the double flashing of vehicles in Taiyuan Lihuayuan every night?

Lihuayuan property safety regulations-no parking on roads in residential areas. If it is a temporary parking, you must turn on the double flashing, otherwise you will be fined, and the illegal vehicles will be refused to enter the community next time. So once the vehicle enters the parking area, it will turn on the double flash. Some vehicles keep flashing to avoid potential safety hazards. This is also a helpless move.