CDL Tanker Endorsement Practice Exam

When taking a curve with a tanker, what is the best practice?

1. Accelerate sharply through the curve

2. Brake hard before entering the curve

3. Slow to a safe speed before entering the curve, then accelerate slightly

4. Maintain speed throughout the curve

The correct answer is: Slow to a safe speed before entering the curve, then accelerate slightly

The best practice when taking a curve with a tanker is to slow to a safe speed before entering the curve and then accelerate slightly. This approach is important for several reasons. Tanker vehicles have a high center of gravity and can be prone to tipping over, especially when cornering. Reducing speed before entering the curve allows the driver to maintain better control of the vehicle and minimizes the risk of a rollover. By entering the curve at a safe speed, the driver can adjust to the dynamics of the load being transported, which can shift during turning maneuvers. Once in the curve, gently accelerating can help stabilize the vehicle. It allows the driver to maintain momentum without creating an excessive lateral force that could lead to Jackknifing or tipping. This controlled acceleration also contributes to keeping the tires properly engaged with the road surface, enhancing traction and control. In contrast, accelerating sharply or braking hard before entering could destabilize the tanker and increase the likelihood of losing control. Maintaining speed could also be risky, as it does not account for the need to adjust to the curvature of the road or the trailer's load dynamics. Therefore, the method of reducing speed before the curve and then easing into a slight acceleration is the best practice for safely navigating curves