King of the Highway: The Ultimate Big Rig & Semi-Truck Operations Challenge
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What is the federal minimum tire tread depth allowed for semi-truck steer tires?
Explanation
The Federal Motor Carrier Safety Administration (FMCSA) mandates a minimum tread depth of 4/32 inch for front steer tires to prevent hydroplaning and blowouts. Drive and trailer tires require at least 2/32 inch.