Brakes must be able to stop a car at 20 miles per hour within 25 feet. This is very important for safety of pedestrians and drivers, as well as for the good of the car.
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The distance required for lawful brakes to stop a car traveling at 20 miles per hour typically ranges from about 25 to 30 feet, depending on factors such as road conditions and the vehicle's braking system. This distance includes the reaction time of the driver and the braking distance itself. It’s important to consider that these distances can vary based on environmental factors and vehicle maintenance.
The answer depends onhow hard the brakes are applied,the quality of the brakes,the quality of the tyres,the quality and condition of the road.
Stopping a vehicle with good brakes from 20 miles per hour under good conditions requires about 80 feet. Leaving at least 80 feet will allow you to stop safely without hitting the car in front of you.
It depends on the state, however, most states require vehicles to be able to stop within 30 feet from 20 mph.