Following an overnight route, a maintenance technician measures the remaining groove depth… — Commercial Driver's License (CDL) General Knowledge Exam

Following an overnight route, a maintenance technician measures the remaining groove depth on each tire of a commercial motor vehicle. Which of the following measured conditions complies with the federal minimum tread depth standards?

A
Steer axle tires maintaining a depth of $\frac{3}{32}\text{ inch}$ in every major groove
B
Steer axle tires maintaining a depth of $\frac{2}{32}\text{ inch}$ in every major groove
Drive axle tires maintaining a depth of $\frac{3}{32}\text{ inch}$ in every major grooveCevap
D
Drive axle tires maintaining a depth of $\frac{1}{32}\text{ inch}$ in every major groove

Cevap

Drive axle tires maintaining a depth of

\frac{3}{32}\text{ inch}

in every major groove represent a fully compliant condition.

Commercial vehicle regulations mandate a minimum tread depth of

\frac{4}{32}\text{ inch}

on front steer tires and

\frac{2}{32}\text{ inch}

on all other tires (drive, tag, and trailer positions). A drive tire with

\frac{3}{32}\text{ inch}

exceeds the legal minimum of

\frac{2}{32}\text{ inch}

, making it fully compliant for highway operation.

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Identify the minimum federal regulatory tread depth requirements by tire position.

Front steering axle tires require a minimum tread depth of

\frac{4}{32}\text{ inch}

, while all other tires (drive and trailer axles) require a minimum of

\frac{2}{32}\text{ inch}

Federal Motor Carrier Safety Regulations establish stricter tread depth minimums on steer tires to maintain directional control and prevent hydroplaning.

Evaluate each tire measurement against its axle-specific threshold.

Drive axle tires at

\frac{3}{32}\text{ inch}

exceed the required

\frac{2}{32}\text{ inch}

threshold, whereas steer tires at

\frac{3}{32}\text{ inch}

\frac{2}{32}\text{ inch}

and drive tires at

\frac{1}{32}\text{ inch}

fall below legal requirements.

Any tire measuring below its designated minimum threshold places the commercial motor vehicle in an unsafe and non-compliant condition.

Anahtar Kavram

Minimum tire tread depth thresholds for steer versus non-steer axles

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