What safety equipment is crucial for stopping a truck from rolling when parked?

Using wheel chocks is a crucial safety measure for preventing a truck from rolling when parked. Wheel chocks are wedge-shaped blocks that are placed under the tires to immobilize the vehicle, especially on inclines or uneven ground. They effectively provide additional resistance against any force that might cause the truck to move, thus enhancing safety.

While brakes are essential for stopping a vehicle during operation, relying solely on them when parked can be risky, especially if the parking brake fails or the truck is on a slope. Emergency lights serve the important function of increasing visibility and alerting others to the presence of a stationary vehicle, but they do not contribute to preventing movement. Tie-downs serve their purpose in securing cargo but are not effective for preventing the roll of the vehicle itself. Therefore, wheel chocks are specifically designed to address the risk of unintended movement in parked trucks, making them the correct choice for this safety concern.