How is stopping distance defined?

Stopping distance is defined as the total distance a vehicle travels from the moment a driver perceives a need to stop until the vehicle comes to a complete halt. This includes both the thinking distance and the braking distance.

Thinking distance refers to the distance a vehicle travels while the driver is cognitively processing the need to stop, which varies depending on reaction time and speed. Braking distance is the distance a vehicle continues to travel after the brakes are applied until it stops, influenced by factors such as speed, road conditions, and vehicle braking efficiency.

The combination of these two distances accurately represents the stopping distance, making option B the correct definition. This understanding is crucial for safe driving practices, especially in emergency situations where timely reaction and effective braking can prevent accidents.