Commercial Driver License (CDL) Class B Practice Test

What are the two special conditions where you should downshift?

1. Before starting down a hill, before entering a curve

2. When driving on a flat road, when making a turn

3. When accelerating, when slowing down

4. Before starting at a stop, when you have stopped

The correct answer is: Before starting down a hill, before entering a curve

Downshifting is a crucial technique in driving, especially for large vehicles like those requiring a Class B Commercial Driver License. The correct scenario for downshifting involves two special conditions: before starting down a hill and before entering a curve. Downshifting before starting down a hill is essential because it allows the driver to engage a lower gear, which can help control the speed of the vehicle. This is particularly important for maintaining safe speeds and ensuring that the brakes do not overheat. Using engine braking in lower gears reduces the reliance on the brake system, enhancing overall control and safety. Similarly, downshifting before entering a curve provides the driver with better handling and stability. When negotiating curves, lower gears allow for smoother acceleration and deceleration, enabling the driver to maintain better traction and control. This technique is vital in preventing the vehicle from rolling over or losing grip, especially when the load shifts in a large vehicle. Other scenarios, such as driving on a flat road or while turning, do not necessitate downshifting in the same way since these conditions often afford more flexibility in gear selection without the same level of concern for speed control or vehicle stability. Additionally, downshifting when accelerating or while at a stop is not as effective in optimizing vehicle