Wheel chocks are used to keep a vehicle from rolling when the opposite end is lifted or when a larger vehicle (or plane) is parked to protect against property damage and injury. Off road chocks are also used in construction so workers can park vehicles on non-paved terrain that may be uneven.
There are several factors to take into consideration when choosing the appropriate wheel chock to use:
- Tire Size
- Usually you will choose a wheel chock at least 1/4 the height of the tire
- Weight of the Vehicle
- Heavier vehicles will need heavier duty chocks and possibly use more than one.
- Grade of the terrain
- Steeper grade will require either heavier duty chocks, more chocks or both.
- Tire Pressure
- Tires with higher air pressure may decrease rolling resistance.
- Type of tire
- Radial tires vs bias ply tires, radial tires can reduce the chock's effectiveness
- Condition of the Ground
- If it is firm, wet, frozen etc. Frozen or wet ground for example may require more chocks, heavier weight bearing chocks or chocks with different grip.
- Park the vehicle on a level surface.
- Set the parking break
- Determine which way the vehicle would roll when you lift the end.
- Place the chock securely between the ground and the back end of the wheel (furthest away from the side you are lifting).
- Kick/push the chock toward the wheel to make sure the fit is secure.
- Do the same on the opposite side of the same wheel and make sure it is secure.
- It is best to secure both wheels with chocks to ensure maximum safety.
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