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Question

Difficulty: MediumTires, Wheels, and Rims Inspection

A terminal safety supervisor performs an audit of recorded tire tread depths on a two-axle freight delivery vehicle before departure. Which of the following tire tread depth measurements complies with federal commercial motor vehicle safety regulations?

  1. A
    A steering axle tire with a measured tread depth of 3/32 inch in all major grooves
  2. A drive axle tire with a measured tread depth of 3/32 inch in all major groovesAnswer
  3. C
    A steering axle tire with a measured tread depth of 2/32 inch in all major grooves
  4. D
    A drive axle tire with a measured tread depth of 1/32 inch in all major grooves

Answer

A drive axle tire with a measured tread depth of 3/32 inch in all major grooves
Commercial motor vehicle safety regulations require a minimum tread depth of 4/32 inch on front steering axle tires and 2/32 inch on all other tires (drive and trailer axles). A drive axle tire with 3/32 inch of tread exceeds the required 2/32-inch threshold and is fully compliant.

Step-by-Step Solution

1
Identify the minimum federal regulatory tread depth requirement for front steering axle tires.
Front steering tires require at least 4/32-inch tread depth in every major groove.
Steering control and hydroplaning resistance demand greater tread depth on steer axles.
2
Identify the minimum federal regulatory tread depth requirement for all other non-steer tires (drive and trailer axles).
Drive and other non-steer tires require at least 2/32-inch tread depth in every major groove.
Federal Motor Carrier Safety Regulations set 2/32 inch as the legal baseline for non-steering positions.
3
Compare each option against its respective axle threshold to determine compliance.
A drive axle tire at 3/32 inch satisfies the 2/32-inch minimum requirement, whereas steer tires at 3/32 inch or 2/32 inch and drive tires at 1/32 inch violate regulations.
Only the 3/32-inch drive tire meets or exceeds its position-specific legal minimum.

Key Concept

Minimum regulatory tire tread depth standards for steer vs. non-steer commercial vehicle axles
Estimated Time:1m 0s
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Topics

Tires, Wheels, and Rims Inspection

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