Question 1
During a pre-trip inspection, a driver measures tread depth in every major groove. Which tire fails the minimum tread-depth requirement?
Show answer & explanation
Correct answer: B - A steering-axle tire with 3/32 inch of even tread
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These 10 free CO-CDL questions are organized by exam domain, so you can see how each part of the Colorado CDL Permit Test blueprint is tested. Reveal the answer and explanation under each question.
During a pre-trip inspection, a driver measures tread depth in every major groove. Which tire fails the minimum tread-depth requirement?
Correct answer: B - A steering-axle tire with 3/32 inch of even tread
Although it is empty, a combination has a power-unit GVWR of 24,500 pounds, a trailer GVWR of 12,000 pounds, and a GCWR of 36,500 pounds. It is not designed for passengers and carries no hazardous materials. The required CDL class is:
Correct answer: A - Class A
A property-carrying driver comes on duty at 6:00 a.m. after 10 consecutive hours off. The driver then takes a three-hour off-duty break from noon to 3:00 p.m.; the break is not part of a qualifying split-sleeper arrangement. The driver has accumulated only eight driving hours by 7:30 p.m. Absent another exception, at what time must driving stop?
Correct answer: D - 8:00 p.m.
A 24-foot, 10,000-pound rigid crate is not blocked against forward movement. Only one securement plan satisfies both the minimum tiedown count and aggregate working-load-limit requirements:
Correct answer: A - Four tiedowns with an aggregate WLL of 5,200 pounds
At highway speed, a front tire blows out and the steering wheel pulls sharply. What should the driver do first?
Correct answer: C - Hold the wheel firmly, avoid braking, and ease off the accelerator
A commercial driver reports for duty with a confirmed alcohol concentration of 0.03. No crash or other offense occurred. Under federal CDL rules, what consequence follows from that reading alone?
Correct answer: B - Placement out of service for 24 hours
A 60-foot combination vehicle is traveling at 55 mph in steady rain. The correct following-distance choice is:
Correct answer: C - More than seven seconds in steady rain
During a pre-trip check on a tractor-semitrailer, the engine is off, the parking brakes are released, and the service brake is fully applied after pressure stabilizes. Air pressure drops 4.6 psi in one minute. This result is:
Correct answer: A - Fail; applied loss exceeds 4 psi per minute
On a long downgrade, reservoir pressure remains normal and no low-air warning appears, but the driver must press harder to obtain less braking after repeatedly riding the service brakes. This pattern is most consistent with:
Correct answer: C - Brake fade from overheated linings and drums
After the normal bulb check, the trailer ABS warning lamp stays on while the service brakes otherwise apply normally. The lamp indicates that:
Correct answer: C - Normal braking remains, but anti-lock protection may be unavailable
The CO-CDL exam also covers these domains. Drill them in the full free practice test:
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