Which stabilizing tool prevents vehicles from moving when they are parked?

• A. Parking brakes
• B. Wheel chocks
• C. Wheel clamps
• D. Traffic cones

Answer: (B)

Wheel chocks provide a positive, physical restraint that blocks a tire from rolling. They’re wedge‑shaped blocks placed snugly against the tire and the ground, usually on the downhill side if the vehicle is on a slope. This setup stops movement even if the parking brake fails or the vehicle tries to roll due to gravity or external forces, making it a reliable stabilizing tool when a vehicle is parked.

Parking brakes rely on the braking system and can fail or be ineffective if not maintained, while wheel clamps immobilize the vehicle but are more suited to enforcing immobilization temporarily and can damage tires. Traffic cones help with visibility but do not physically prevent movement.