CDL Tanker Endorsement Practice Exam

What should you be particularly cautious about when driving smooth bore tankers?

1. Making wide turns

2. Speeding on highways

3. Starting or stopping

4. Driving in reverse

The correct answer is: Starting or stopping

When driving smooth bore tankers, particular caution should be exercised regarding starting or stopping. This is primarily due to the unique dynamics of the fluid cargo within a smooth bore tank. The movement of the liquid can create surge effects, which means that when the vehicle starts or stops, the liquid shifts suddenly. This surge can affect the stability and control of the tanker, necessitating a more gradual approach to acceleration and deceleration. Unlike other types of loads, the liquid shifts back and forth, which can lead to potential loss of control if the driver does not anticipate the effects of the liquid movement. Braking suddenly may cause the tank to tip or create a sliding effect, making it difficult for the driver to maintain control. Therefore, understanding how to manage the start and stop effectively is crucial while operating these vehicles to ensure safety for both the driver and other road users.