When Not including thinking and reaction distance at 20 miles per hour lawful brakes should stop a car within?

When not including thinking and reaction distance, lawful brakes should stop a car traveling at 20 miles per hour within approximately 20 to 30 feet, depending on the vehicle's braking system and road conditions. This distance can vary slightly based on factors such as the weight of the vehicle and the surface of the road. It's important to always maintain a safe following distance to account for any necessary stopping.