CDL Tanker Endorsement Practice Exam

How does liquid surge affect the handling of a tanker?

1. It keeps the truck stable

2. It can move the truck in the direction of the liquid waves

3. It increases the braking distance

4. It decreases the speed of the truck

The correct answer is: It can move the truck in the direction of the liquid waves

Liquid surge occurs when the liquid inside a tanker moves back and forth as the vehicle accelerates, decelerates, or turns. This movement creates waves of liquid that can significantly influence the handling of the tanker. When the liquid shifts, it can apply forces that move the truck in the direction of the liquid waves. For instance, if the liquid surges forward in the tank, it can push the truck forward, altering the driver's control and potentially leading to a loss of stability. The impact of this phenomenon illustrates the importance of cautious driving when handling tankers, as the shifting weight can make the vehicle more difficult to control, especially during sharp turns or emergency maneuvers. This aspect of handling requires drivers to be particularly attentive to the effects of liquid movement and adjust their driving style accordingly to ensure safety on the road.