When hauling hazmat, you must stop and check any dual tires at least once every ________, whichever is less.

• A. 2 hours or 100 miles
• B. 4 hours or 200 miles
• C. 1 hour or 50 miles
• D. 3 hours or 150 miles

Answer: (A)

When hauling hazardous materials, you actively monitor for tire problems because a failure on the road can create serious safety risks with dangerous cargo. You must stop and inspect any dual tires at least every two hours or every 100 miles, whichever comes first. That "whichever is less" rule makes inspections more frequent on shorter trips and still keeps checks timely on longer ones, reducing the chance of a slow leak, overheated tires, or other damage going unnoticed.

During the stop, look for signs of wear, cuts, bulges, embedded objects, or changes in inflation on both tires in the dual pair, and ensure the tires are properly inflated and free of debris between them. If you notice heat, excessive wear, or air loss, address it before continuing.

The other interval options would allow longer gaps between checks, which could miss developing tire issues, increasing the risk of a blowout or failure on a hazardous material load.