Question

injury caused by unexpected vehicle movement is a common hazard in a repair shop. the heavy weight of a motor vehicle can cause severe injuries to human body.

• wheel straps are commonly used to secure a vehicle to a trailer. similar straps are used to secure a vehicle in place on a chassis dynamometer.
• wheel chocks or wedges should be used anytime a vehicle engine is being run in the shop. this is to help keep the vehicle stationary should the transmission accidentally be placed into gear. for this reason you should always place a wedge in front and rear of at least one drive wheel.

if the work requires the vehicle to be immobilized, follow published service procedures and never skip a required safety step. this is especially true when working on hybrid and electric cars.
note: its a good idea to roll down the drivers window anytime the vehicle is being worked on. this ensures the ignition switch can be easily accessed from outside the car in an emergency; as well as eliminate the possibility of accidentally locking the keys inside the vehicle when the engine is running.
1
a vehicle should be secured when being worked on in the shop, what are most common ways to keep a vehicle from accidental moving while being serviced or repaired? look at the pictures on the left.
chock the wheels with wedges.
strap the vehicle down.
take the wheels off.

Explanation:

The text mentions using wheel chocks (wedges) to keep the vehicle stationary and wheel straps to secure a vehicle. There is no mention of taking the wheels off as a common way to prevent accidental movement.

Answer:

Chock the wheels with wedges.
Strap the vehicle down.