Hot Tip #2

Always use two chocks to chock tires. For safe arrest, the chocks resistant force MUST exceed the force exerted by the vehicle.

This can be determined given:

• Tire size
• Percent grade
• Road surface conditions
• Gross vehicle weight (GVW)

*For this example:Our HWG Super Gripper was used.

• Tire Size: 22.5r
• Percent Grade: 30 %
• GVW: 80,000 lbs.

Although we test our chocks against the SAE J348 wheel chock standard, the more reasonable goal is to meet or exceed the parking brake standard for that vehicle.