ILLINOIS CLASS B NON-CDL EXAM –
ILLINOIS SECRETARY OF STATE (SOS)
– 2026/2027
1. According to Illinois SOS regulations, what is the maximum Gross Vehicle Weight Rating
(GVWR) a Class B license holder can operate while towing a trailer that does not exceed
10,000 lbs?
A. 26,001 lbs or more
B. Exactly 26,000 lbs
C. 16,001 lbs or more
D. Up to 15,999 lbs
Answer: A
Conceptual Explanation: A Class B license is required for any single vehicle with a GVWR
of 26,001 lbs or more, or any such vehicle towing another vehicle not in excess of 10,000
lbs.
,2. When checking the air brake system, the air compressor should stop pumping (cut-out) at
approximately what pressure?
A. 100 psi
B. 150 psi
C. 125 psi
D. 85 psi
Answer: C
Conceptual Explanation: The air governor should cut out the compressor when the tank
pressure reaches approximately 125 pounds per square inch (psi).
3. In an Illinois Class B vehicle equipped with air brakes, the low air pressure warning signal
must activate before the pressure drops below:
A. 20 psi
B. 40 psi
C. 80 psi
D. 60 psi
Answer: D
Conceptual Explanation: Federal and State regulations require a warning signal to come
on before the air pressure in the tanks falls below 60 psi.
, 4. What is the minimum tread depth required for the front (steer) tires of a Class B vehicle in
Illinois?
A. 2/32 of an inch
B. 4/32 of an inch
C. 1/32 of an inch
D. 6/32 of an inch
Answer: B
Conceptual Explanation: Front tires must have at least 4/32-inch tread depth in every
major groove. Other tires must have at least 2/32-inch.
5. When parked on a one-way or divided highway, where should the three emergency
reflective triangles be placed?
A. 10 feet in front, 10 feet behind, and 100 feet behind
B. 50 feet, 100 feet, and 150 feet behind the vehicle
C. 10 feet, 50 feet, and 100 feet in front of the vehicle
D. 10 feet, 100 feet, and 200 feet toward the approaching traffic
Answer: D
Conceptual Explanation: On a divided highway, triangles must be placed at 10 feet, 100
feet, and 200 feet toward the approaching traffic.
ILLINOIS SECRETARY OF STATE (SOS)
– 2026/2027
1. According to Illinois SOS regulations, what is the maximum Gross Vehicle Weight Rating
(GVWR) a Class B license holder can operate while towing a trailer that does not exceed
10,000 lbs?
A. 26,001 lbs or more
B. Exactly 26,000 lbs
C. 16,001 lbs or more
D. Up to 15,999 lbs
Answer: A
Conceptual Explanation: A Class B license is required for any single vehicle with a GVWR
of 26,001 lbs or more, or any such vehicle towing another vehicle not in excess of 10,000
lbs.
,2. When checking the air brake system, the air compressor should stop pumping (cut-out) at
approximately what pressure?
A. 100 psi
B. 150 psi
C. 125 psi
D. 85 psi
Answer: C
Conceptual Explanation: The air governor should cut out the compressor when the tank
pressure reaches approximately 125 pounds per square inch (psi).
3. In an Illinois Class B vehicle equipped with air brakes, the low air pressure warning signal
must activate before the pressure drops below:
A. 20 psi
B. 40 psi
C. 80 psi
D. 60 psi
Answer: D
Conceptual Explanation: Federal and State regulations require a warning signal to come
on before the air pressure in the tanks falls below 60 psi.
, 4. What is the minimum tread depth required for the front (steer) tires of a Class B vehicle in
Illinois?
A. 2/32 of an inch
B. 4/32 of an inch
C. 1/32 of an inch
D. 6/32 of an inch
Answer: B
Conceptual Explanation: Front tires must have at least 4/32-inch tread depth in every
major groove. Other tires must have at least 2/32-inch.
5. When parked on a one-way or divided highway, where should the three emergency
reflective triangles be placed?
A. 10 feet in front, 10 feet behind, and 100 feet behind
B. 50 feet, 100 feet, and 150 feet behind the vehicle
C. 10 feet, 50 feet, and 100 feet in front of the vehicle
D. 10 feet, 100 feet, and 200 feet toward the approaching traffic
Answer: D
Conceptual Explanation: On a divided highway, triangles must be placed at 10 feet, 100
feet, and 200 feet toward the approaching traffic.
