CDL Tanker Endorsement Practice Exam

What handling effect is expected with a cargo tank that has baffles?

1. More front to back surge

2. Less front to back surge

3. Equal front to back and side to side surge

4. No surge at all

The correct answer is: Less front to back surge

When a cargo tank is equipped with baffles, it is designed to minimize the movement of liquid within the tank during transit. Baffles are internal structures that interrupt the flow of liquid, reducing the surge that can occur as the vehicle accelerates, decelerates, or turns. With baffles in place, the liquid can't freely slosh back and forth, which significantly decreases the front-to-back surge that can affect the stability of the vehicle and the driver's control. This reduced momentum shift provides better handling characteristics, making it safer for the driver to manage changes in speed and direction. While baffles greatly reduce the surge, they do not eliminate it completely, so while the answer is correct in indicating less surge, it’s important to understand that while the baffles help to control the liquid motion, some degree of fluid movement can still occur.