How many meters before and after the battery car is an emergency stop?

Within 3 meters. When the front battery car and the rear battery car are less than 3 meters, it is an emergency brake. When an electric bicycle is riding at a speed of 20km/h, the dry braking distance should not be greater than 4m, and the wet braking distance should not be greater than15m. Electric vehicles, that is, electric drive vehicles, also known as electric vehicles, are divided into AC electric vehicles and DC electric vehicles.