10 exam-style questions with answers and explanations, straight from our 1,030-question bank. Tap an answer to check yourself. When you're ready, take the scored version in the free practice test.
These 10 free IL-CDL questions are organized by exam domain, so you can see how each part of the Illinois CDL Permit Test blueprint is tested. Reveal the answer and explanation under each question.
A carrier will operate a straight truck with a GVWR of 28,000 pounds while towing a trailer with a GVWR of 9,500 pounds. The combination has a GCWR of 37,500 pounds and carries neither passengers nor placardable hazardous materials. The required CDL class is:
Correct answer: C - Class B, because the power unit is at least 26,001 pounds and the trailer is 10,000 pounds or less
A driver measures tread depth in every major groove during a pre-trip inspection. The measurement that fails the CDL minimum is:
Correct answer: A - 3/32 inch on a steering-axle tire
A 60-foot tractor-trailer is traveling at 45 mph on a dry, level road. Under the standard CDL following-distance rule, the minimum interval before adding extra space for traffic or weather is:
Correct answer: D - 7 seconds
A flatbed carries an 11,000-pound steel fabrication that is blocked against forward movement and is not subject to a commodity-specific securement rule. Its rated tiedowns provide an aggregate WLL of 5,000 pounds. Which proposed correction satisfies the general securement requirement?
Correct answer: B - Add rated tiedowns to raise aggregate WLL to 6,000 pounds
A fully loaded truck is approaching a long downgrade with a safe descent speed of 35 mph. The soundest speed-control plan is to:
Correct answer: A - Select a low gear before descending, brake to about 30 mph, release the brakes, and repeat at 35 mph
At highway speed, a steering-axle tire suddenly blows out, but the truck is still tracking within its lane. The driver's immediate response should be to:
Correct answer: D - Grip the wheel firmly, avoid braking initially, ease off, then slow and pull off
A driver moving from interstate freight operations to an interstate intercity passenger carrier assumes the property-carrier 11-hour/14-hour rule still applies. After the required off-duty period, the passenger-carrier limits are:
Correct answer: C - 10 hours driving within 15 hours on duty after 8 hours off
A combination vehicle is fully charged. With the engine off, wheels chocked, parking brakes released, and the service brake held fully applied, pressure drops 5 psi in one minute after the initial loss stabilizes. This result means the vehicle:
Correct answer: B - Fails because the applied combination limit is 4 psi per minute
While the vehicle is moving, the low-air warning activates at 56 psi. The service brakes still respond, but system pressure continues to fall. The proper response is to:
Correct answer: D - Stop safely while usable service pressure remains rather than waiting for the spring brakes to apply
After the air system completes its self-check, the ABS warning lamp remains on. Static leakage, applied leakage, parking-brake, and low-speed service-brake tests all pass, with no other defect found. The appropriate disposition is to:
Correct answer: A - Brake normally and arrange prompt ABS repair; the foundation brakes remain available
The IL-CDL exam also covers these domains. Drill them in the full free practice test:
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