ILLINOIS COMMERCIAL DRIVER LICENSE
(CDL) ENDORSEMENT EXAM PRACTICE
QUESTIONS WITH CORRECT ANSWERS
(VERIFIED ANSWERS) PLUS RATIONALES
2026 Q&A | INSTANT DOWNLOAD PDF.
1. What is the maximum legal weight for a single axle on a highway
in Illinois?
A. 18,000 lbs.
B. 20,000 lbs.
C. 22,000 lbs.
D. 24,000 lbs.
This is the federally regulated maximum weight for a single axle
on Illinois highways.
2. When driving a vehicle with air brakes, you should check the air
pressure gauge:
A. Only before starting your trip
B. Every two hours
C. During your pre-trip inspection and while driving
D. Only after stopping
Checking air pressure during pre-trip and operation ensures safe
braking performance.
3. How often must a CDL driver inspect cargo?
A. Only at the start of the trip
B. Within the first 50 miles and every 150 miles or 3 hours
C. Once per day
, D. Only if the cargo shifts
Federal regulations require checks shortly after starting and at
regular intervals.
4. Which of the following is required to have a CDL passenger
endorsement?
A. School bus only
B. Taxi drivers
C. Any vehicle designed to transport 16 or more passengers
D. Pickup trucks
Vehicles carrying 16+ passengers require a passenger
endorsement.
5. A “no-zones” are:
A. Areas where trucks cannot park
B. Highway construction zones
C. Blind spots around large vehicles
D. Restricted parking areas
Blind spots around large vehicles create dangerous zones that
drivers should avoid.
6. What should you do when approaching a railroad crossing with no
signals?
A. Speed up to cross quickly
B. Stop only if a train is visible
C. Slow down, look, and listen for trains
D. Honk continuously
Drivers must always check visually and audibly for trains at
uncontrolled crossings.
7. When transporting hazardous materials, placards must be:
A. Only on the front
B. Only on the back
, C. On all four sides of the vehicle
D. Optional if the load is less than 500 lbs
Placards on all sides alert emergency responders and the public to
hazardous materials.
8. The best way to prevent skids on slippery roads is to:
A. Drive faster
B. Pump the brakes
C. Reduce speed before entering slippery areas
D. Follow other vehicles closely
Slowing down before entering slippery conditions helps maintain
control.
9. When driving a vehicle with a manual transmission, to descend a
long, steep hill safely, you should:
A. Use the service brake continuously
B. Shift to a higher gear
C. Shift to a lower gear and use brakes lightly
D. Coast in neutral
Using engine braking reduces overheating of the service brakes.
10. How many hours of service can a CDL driver drive after 10
consecutive hours off duty?
A. 8 hours
B. 11 hours
C. 12 hours
D. 10 hours
Federal Hours-of-Service regulations allow 11 driving hours after
10 consecutive hours off duty.
11. What is the minimum tread depth for front tires on a
commercial vehicle?
A. 2/32 inch
(CDL) ENDORSEMENT EXAM PRACTICE
QUESTIONS WITH CORRECT ANSWERS
(VERIFIED ANSWERS) PLUS RATIONALES
2026 Q&A | INSTANT DOWNLOAD PDF.
1. What is the maximum legal weight for a single axle on a highway
in Illinois?
A. 18,000 lbs.
B. 20,000 lbs.
C. 22,000 lbs.
D. 24,000 lbs.
This is the federally regulated maximum weight for a single axle
on Illinois highways.
2. When driving a vehicle with air brakes, you should check the air
pressure gauge:
A. Only before starting your trip
B. Every two hours
C. During your pre-trip inspection and while driving
D. Only after stopping
Checking air pressure during pre-trip and operation ensures safe
braking performance.
3. How often must a CDL driver inspect cargo?
A. Only at the start of the trip
B. Within the first 50 miles and every 150 miles or 3 hours
C. Once per day
, D. Only if the cargo shifts
Federal regulations require checks shortly after starting and at
regular intervals.
4. Which of the following is required to have a CDL passenger
endorsement?
A. School bus only
B. Taxi drivers
C. Any vehicle designed to transport 16 or more passengers
D. Pickup trucks
Vehicles carrying 16+ passengers require a passenger
endorsement.
5. A “no-zones” are:
A. Areas where trucks cannot park
B. Highway construction zones
C. Blind spots around large vehicles
D. Restricted parking areas
Blind spots around large vehicles create dangerous zones that
drivers should avoid.
6. What should you do when approaching a railroad crossing with no
signals?
A. Speed up to cross quickly
B. Stop only if a train is visible
C. Slow down, look, and listen for trains
D. Honk continuously
Drivers must always check visually and audibly for trains at
uncontrolled crossings.
7. When transporting hazardous materials, placards must be:
A. Only on the front
B. Only on the back
, C. On all four sides of the vehicle
D. Optional if the load is less than 500 lbs
Placards on all sides alert emergency responders and the public to
hazardous materials.
8. The best way to prevent skids on slippery roads is to:
A. Drive faster
B. Pump the brakes
C. Reduce speed before entering slippery areas
D. Follow other vehicles closely
Slowing down before entering slippery conditions helps maintain
control.
9. When driving a vehicle with a manual transmission, to descend a
long, steep hill safely, you should:
A. Use the service brake continuously
B. Shift to a higher gear
C. Shift to a lower gear and use brakes lightly
D. Coast in neutral
Using engine braking reduces overheating of the service brakes.
10. How many hours of service can a CDL driver drive after 10
consecutive hours off duty?
A. 8 hours
B. 11 hours
C. 12 hours
D. 10 hours
Federal Hours-of-Service regulations allow 11 driving hours after
10 consecutive hours off duty.
11. What is the minimum tread depth for front tires on a
commercial vehicle?
A. 2/32 inch
