Reaction: you haven’t touched the brake yet Braking

An estimate for teaching. It uses standard physics with the Federal Highway Administration’s braking values (emergency stop on dry pavement 0.7g, wet 0.4g, snow 0.22g, ice 0.15g) and starts at the 2.5-second design reaction time. Real stopping distances vary with the vehicle, tires, brakes, load, slope and driver.