Virginia CDL General Knowledge Practice Test 2026 - Free CDL Practice Questions and Study Guide

The anti-lock braking system (ABS) is designed specifically to enhance a driver's control over the vehicle during situations that might lead to skidding, particularly on wet or slippery surfaces. When a driver applies the brakes on a wet road, there is a tendency for the wheels to lock up, which can result in a loss of control or skidding. ABS prevents this by automatically modulating brake pressure, allowing the wheels to continue rotating while slowing the vehicle down, thus maintaining steering control.

This is crucial in wet conditions, as it enables drivers to stop more safely without losing the ability to steer away from potential hazards. The other systems mentioned, while they play important roles in vehicle operation, do not directly address the need to maintain control during braking under slippery conditions.