Illinois CDL General Knowledge: Driver Fitness Test 2026

Fitness to drive is testable, and the Illinois CDL driver fitness and hours of service test checks whether you know the limits before a dispatcher pushes them. This 2026 Illinois CDL hours of service practice test covers daily driving and on-duty ceilings, the required off-duty break, the weekly limit and how a restart works, honest logging, and the disqualifications that follow falsified records.

Health sits alongside hours here. The Illinois CDL driver fitness questions deal with the medical certificate, vision and hearing standards, illness and medication that make driving unsafe, and the simple truth that no schedule justifies driving drowsy. Long hauls down I-55 and I-90 make these rules practical rather than theoretical.

Study this drill against the Illinois CDL Manual, which reflects the federal regulations the Illinois Secretary of State examines on. The complete general knowledge exam is 50 questions with an 80 percent threshold, so 40 correct answers is what you are aiming for on test day.

Keep going:

• Illinois CDL Practice Test
• Illinois CDL Practice Test 2
• Illinois CDL Practice Test 3
• Illinois CDL Practice Test 4
• Illinois Air Brakes Practice Test
• Illinois CDL Combination Practice Test
• Illinois CDL Pre-Trip Inspection Practice Test
• Illinois Hazmat Practice Test
• Illinois Class A CDL Practice Test
• Illinois CDL Practice Test

Every question traces back to the Illinois CDL Manual - skim the right-of-way and signs chapters before your retake.