ILLINOIS CLASS B NON-CDL
COMPREHENSIVE EXAMINATION
QUESTIONS AND ANSWERS
1. According to Illinois law, a Class B license is required for any single vehicle with a Gross
Vehicle Weight Rating (GVWR) of at least:
A. 16,001 lbs
B. 26,001 lbs
C. 10,001 lbs
D. 33,001 lbs
Answer: B
Conceptual Explanation: In Illinois, a Class B non-CDL is required for vehicles with a
GVWR of 26,001 lbs or more, provided the towed unit is less than 10,000 lbs.
2. What is the maximum legal width for any vehicle, including its load, on Illinois highways
(excluding mirrors and safety devices)?
A. 8 feet 6 inches
B. 9 feet 0 inches
C. 8 feet 0 inches
,D. 102 inches plus 6 inches overhang
Answer: A
Conceptual Explanation: The maximum legal width for vehicles on Illinois roads is 8 feet
6 inches (102 inches).
3. What is the maximum legal height for all vehicles on Illinois highways?
A. 13 feet 0 inches
B. 14 feet 0 inches
C. 12 feet 6 inches
D. 13 feet 6 inches
Answer: D
Conceptual Explanation: The maximum legal height for any vehicle in Illinois is 13 feet 6
inches.
4. When driving a vehicle with a high center of gravity, you should:
A. Take turns significantly slower than the posted speed limit
B. Accelerate slightly during the turn to maintain traction
C. Take turns at the posted speed limit
D. Only worry about speed if the load is liquid
Answer: A
, Conceptual Explanation: High center of gravity vehicles are prone to rollovers; therefore,
turns must be taken slower than the speed posted for smaller cars.
5. If your vehicle is equipped with air brakes, at what PSI should the low air pressure warning
light and/or buzzer activate?
A. 80 PSI
B. 40 PSI
C. 60 PSI
D. 100 PSI
Answer: C
Conceptual Explanation: Federal and state safety standards require the low air warning
to activate when pressure drops below 60 PSI.
6. When performing a pre-trip inspection, what is the minimum tread depth required for the
steering axle (front) tires?
A. 2/32 of an inch
B. 4/32 of an inch
C. 6/32 of an inch
D. 1/32 of an inch
Answer: B
COMPREHENSIVE EXAMINATION
QUESTIONS AND ANSWERS
1. According to Illinois law, a Class B license is required for any single vehicle with a Gross
Vehicle Weight Rating (GVWR) of at least:
A. 16,001 lbs
B. 26,001 lbs
C. 10,001 lbs
D. 33,001 lbs
Answer: B
Conceptual Explanation: In Illinois, a Class B non-CDL is required for vehicles with a
GVWR of 26,001 lbs or more, provided the towed unit is less than 10,000 lbs.
2. What is the maximum legal width for any vehicle, including its load, on Illinois highways
(excluding mirrors and safety devices)?
A. 8 feet 6 inches
B. 9 feet 0 inches
C. 8 feet 0 inches
,D. 102 inches plus 6 inches overhang
Answer: A
Conceptual Explanation: The maximum legal width for vehicles on Illinois roads is 8 feet
6 inches (102 inches).
3. What is the maximum legal height for all vehicles on Illinois highways?
A. 13 feet 0 inches
B. 14 feet 0 inches
C. 12 feet 6 inches
D. 13 feet 6 inches
Answer: D
Conceptual Explanation: The maximum legal height for any vehicle in Illinois is 13 feet 6
inches.
4. When driving a vehicle with a high center of gravity, you should:
A. Take turns significantly slower than the posted speed limit
B. Accelerate slightly during the turn to maintain traction
C. Take turns at the posted speed limit
D. Only worry about speed if the load is liquid
Answer: A
, Conceptual Explanation: High center of gravity vehicles are prone to rollovers; therefore,
turns must be taken slower than the speed posted for smaller cars.
5. If your vehicle is equipped with air brakes, at what PSI should the low air pressure warning
light and/or buzzer activate?
A. 80 PSI
B. 40 PSI
C. 60 PSI
D. 100 PSI
Answer: C
Conceptual Explanation: Federal and state safety standards require the low air warning
to activate when pressure drops below 60 PSI.
6. When performing a pre-trip inspection, what is the minimum tread depth required for the
steering axle (front) tires?
A. 2/32 of an inch
B. 4/32 of an inch
C. 6/32 of an inch
D. 1/32 of an inch
Answer: B
