CDL Tanker Endorsement Practice Exam

What is a leading factor in determining the stopping distance of a tank vehicle?

1. The weight of the cargo

2. The type of cargo

3. The type of road surface

4. All of the above

The correct answer is: All of the above

Stopping distance for a tank vehicle is influenced by several key factors, which is why the answer is "All of the above." The weight of the cargo plays a significant role in stopping distance because heavier loads require more time and distance to come to a complete stop. Increased weight affects the vehicle's momentum, meaning that the brakes must work harder to halt the vehicle. The type of cargo is relevant as well. Different types of liquids can shift within the tank during motion, which can affect the vehicle's stability and braking. For example, a partially filled tank can create a sloshing effect that alters the center of gravity and impacts how the vehicle must be controlled and stopped. Additionally, the type of road surface directly affects traction. Different surfaces, such as gravel, asphalt, or wet and slippery roads, will change the friction between the tires and the ground, which can greatly vary stopping distances. A slick or uneven surface can greatly extend the distance necessary to come to a full stop. Considering all of these factors collectively underscores the complexity of safely stopping a tank vehicle and emphasizes that all contribute significantly to the overall stopping distance.