Warn traffic light / Quickly remove a car acci

In the car on the road when the car is often behind the car do not know what happened, are known to be a car
accident,or ambulance in the vicinity to know when a car accident, if there is a traffic number can let Near the car to
know a car accident can be an early ambulance through, as well as an accident when the ambulance did not rush
when you can use some first aid equipment to help the injury so that it will not miss the golden time of the rescue