According to Article 66 of the Regulations for the Implementation of the Law of the People's Republic of China on Road Traffic Safety, police cars, fire engines, ambulances and engineering rescue vehicles can intermittently use alarms when traffic is blocked when performing emergency tasks, and abide by the following provisions:
1. Don't use the alarm in areas or road sections where the alarm is prohibited;
2. Do not use alarms in urban areas at night;
3. When driving in line, if the front car has already used the alarm, the rear car will no longer use the alarm.
Extended data:
Article 15 of the Road Traffic Safety Law of the People's Republic of China * * * Police cars, fire engines, ambulances and engineering rescue vehicles shall be painted with logo patterns in accordance with regulations, and alarm devices and sign lights shall be installed. Other motor vehicles are not allowed to spray, install or use logo patterns, alarms or sign lamps dedicated to or similar to the above-mentioned vehicles.
Police cars, fire engines, ambulances and engineering rescue vehicles shall be used in strict accordance with the prescribed purposes and conditions. Special vehicles for highway supervision and inspection shall be equipped with unified signs and warning lights in accordance with the provisions of the Highway Law.
Baidu Encyclopedia-Regulations for the Implementation of the Road Traffic Safety Law of the People's Republic of China