Emergency Vehicle Technician (EVT) L-1 Practice Exam

What is the main purpose of placing wheel chocks during stabilization on an uneven surface?

To prevent the vehicle from moving. To stabilize the patient. To enhance lighting. To protect tires from wear.

Correct Answer:

To prevent the vehicle from moving.

Explanation:

When stabilizing a vehicle on uneven ground, the primary goal is to stop any unintended movement. Wheel chocks provide a solid barrier between the wheel and the ground, using the weight of the chock and the friction between tire and surface to prevent rolling. This is crucial because uneven terrain can cause a slight shift in weight or tool movement to translate into wheel motion as you work, which could compromise the scene safety and patient care. Chocks are used to lock the vehicle in place so stabilization devices and personnel can operate without the vehicle creeping or rolling. They don’t directly stabilize the patient, nor do they enhance lighting or protect tires from wear; their job is specifically to prevent motion of the vehicle.

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