CDL Tanker Endorsement Practice Exam

What is true about emergency steering and tankers?

1. Always apply the brakes

2. Steering should not be combined with braking during quick movements

3. You should only steer without braking at high speeds

4. Turning sharply increases stability

The correct answer is: Steering should not be combined with braking during quick movements

When driving a tanker, especially under emergency conditions, the handling of the vehicle requires a delicate balance. The statement regarding steering not being combined with braking during quick movements is significant because combining these actions can lead to loss of control, especially in a vehicle that carries liquids. Tankers carry cargo that is often in a sloshing state. When a driver attempts to brake while turning or making a quick maneuver, it can cause the liquid to shift, potentially leading to a rollover or jackknife situation. This is particularly critical when high speeds are involved, as the dynamics of a tanker change drastically with the movement of the liquid inside. Maintaining control and stability during an emergency situation involves steering while keeping the vehicle's speed manageable without sudden braking. This allows for the smoothest maneuvering possible, reducing the chance of the liquid cargo destabilizing the vehicle. Therefore, understanding the impact of steering and braking interactions is essential for safe tanker operation.