Which of the following statements is true about ABS?

The statement that ABS, or Anti-lock Braking System, prevents the wheels from locking during hard braking is accurate. ABS is designed to improve vehicle control and decrease stopping distances on slippery surfaces by preventing the wheels from locking up. When a driver applies hard brakes, the system automatically modulates brake pressure to ensure that the wheels continue to turn, allowing the driver to maintain steering control while slowing down. This feature is beneficial in avoiding skidding and helps the driver navigate during emergency stops by maintaining traction.

The other options present statements that do not accurately reflect the operation or purpose of ABS. For instance, while ABS is effective on various road conditions, stating that it can only be activated on dry roads is misleading, as the system is intended to enhance braking performance on wet or slippery surfaces as well. Additionally, while ABS can have limitations in severe icy conditions, it certainly offers improved control compared to vehicles without ABS. Lastly, ABS is generally standard on most newer vehicles rather than being an optional feature, as manufacturers strive to include safety technologies as a priority in vehicle design.