King of the Highway: The Ultimate Big Rig & Semi-Truck Operations Challenge

What is the federal minimum tire tread depth allowed for semi-truck steer tires?

25%

Correct!

Incorrect!

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.

What is the federal minimum tire tread depth allowed for semi-truck steer tires?

1/32 inch

6/32 inch

2/32 inch

4/32 inch

25%