Stopping distance is the sum of which distances?

Stopping distance is the sum of which distances?

• A. Stops in the distance traveled during braking
• B. Sum of driver decision distance and braking distance
• C. Distance equals path length
• D. Stopping distance equals sum of driver decision distance and braking distance

Answer: (D)

Stopping distance is the total distance a vehicle travels from the moment the driver notices a hazard until it comes to a stop. It combines two parts: the distance traveled during the driver's perception and decision time before braking starts (driver decision distance), and the distance traveled while actually braking (braking distance). You can think of it as: while you react, the car keeps moving, and then, once you begin braking, it continues to roll to a stop. Add those two distances together to get the full stopping distance. The other ideas miss one of these parts or describe something unrelated like only the braking portion or just a general path length, so they don’t accurately define stopping distance.

Stopping distance is the total distance a vehicle travels from the moment the driver notices a hazard until it comes to a stop. It combines two parts: the distance traveled during the driver's perception and decision time before braking starts (driver decision distance), and the distance traveled while actually braking (braking distance). You can think of it as: while you react, the car keeps moving, and then, once you begin braking, it continues to roll to a stop. Add those two distances together to get the full stopping distance. The other ideas miss one of these parts or describe something unrelated like only the braking portion or just a general path length, so they don’t accurately define stopping distance.