Colorado CDL Practice Test

What defines total stopping distance?

1. The distance required to react to a hazard only

2. The total distance traveled before reaching a stop, considering all factors

3. The distance traveled after starting to brake

4. The distance between two vehicles on a highway

The correct answer is: The total distance traveled before reaching a stop, considering all factors

Total stopping distance is defined as the entire distance a vehicle travels from the moment the driver perceives a hazard until the vehicle comes to a complete stop. This measurement includes several key components: the perception distance (the distance traveled while the driver recognizes a hazard), the reaction distance (the distance the vehicle moves while the driver is reacting and deciding to brake), and the braking distance (the distance the vehicle travels while braking until it comes to a full stop). Understanding total stopping distance is crucial for safe driving, as it helps drivers gauge how much space they need to avoid collisions, especially in different driving conditions. It's important to note that this distance can vary based on factors like the vehicle's speed, road conditions, and the driver's reaction time, making it a comprehensive representation of how long it takes to stop a vehicle in response to a hazard. The choice that refers only to the distance required to react to a hazard does not account for the necessary braking time. The option focused solely on the distance traveled after braking starts neglects the crucial perception and reaction phases. Lastly, mentioning the distance between two vehicles on a highway does not pertain to stopping distance at all but rather relates to safe following distances.