Which of the following best describes the sum of braking distance and reaction distance?

• A. Stopping distance
• B. Speed
• C. Fuel consumption
• D. Turning radius

Answer: (A)

Stopping distance is the total distance a vehicle travels from the moment you notice a hazard to the moment it stops. It’s made up of two parts: reaction distance and braking distance. Reaction distance is how far you travel before you start braking after you see the hazard, and it depends on your speed and reaction time. Braking distance is how far you travel after you begin braking until you stop, influenced by speed, road conditions, brakes, tires, and vehicle weight. Adding these two parts gives the stopping distance. The other options don’t describe a distance that combines your reaction with braking—speed is a rate, fuel consumption isn’t about stopping, and turning radius relates to turning, not stopping.