DOT Inspector Vehicle Inspection Procedures 3

Question 1

According to FMCSA regulations, what minimum tread depth is required for front steering axle tires?

Accepted Answer

4/32 inch

Answer

Front steering axle tires must have a minimum tread depth of 4/32 inch, while other axle tires require 2/32 inch.

Question 2

When inspecting cargo securement, what is the minimum number of tiedowns required for a single piece of cargo that is 10 feet long and weighs 4,000 lbs?

Accepted Answer

2

Answer

Cargo up to 10 feet in length requires a minimum of 2 tiedowns regardless of weight, per FMCSA 393.106.

Question 3

Which lighting defect would NOT place a vehicle out of service during a roadside inspection?

Accepted Answer

A single non-required auxiliary light that is burned out

Answer

Non-required auxiliary lights that are inoperable do not constitute an out-of-service condition; only required lights must be functional.

Question 4

An inspector notices a hydraulic brake line has a bulge in the rubber hose under full brake application. What is the correct determination?

Accepted Answer

Out-of-service condition

Answer

Any brake hose that bulges, swells, or shows signs of failure under pressure is an immediate out-of-service condition per FMCSA 393.45.

Question 5

During inspection of a combination vehicle, how far must the kingpin be from the trailer's rear axle(s) before kingpin placement requires review?

Accepted Answer

Kingpin-to-rear-axle spacing affects bridge formula compliance

Answer

The kingpin-to-rear-axle spacing is critical for bridge formula compliance, which limits axle group weights based on distance between axles.

DOT Inspector Certification Practice Test

DOT Inspector Certification Practice Test

DOT Inspector Vehicle Inspection Procedures 3