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A tread depth of ____ should be in every major groove of a front tire.
A.  1/32 of an inch
B.  2/32 of an inch
C.  4/32 of an inch
For safe operation, a commercial motor vehicle needs a tread depth of 4/32 of an inch in every major groove on the front tires, and a tread depth of 2/32 of an inch on other tires.
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