COMMERCIAL DRIVER’S LICENSE (CDL)
CLASS A PRACTICE EXAM QUESTIONS
AND CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2026 Q&A
| INSTANT DOWNLOAD PDF
1. What is the maximum allowable weight on a single axle for a Class A
commercial vehicle?
A) 10,000 lbs
B) 20,000 lbs
C) 34,000 lbs
D) 40,000 lbs
Rationale: Federal regulations limit a single axle to 34,000 lbs to prevent
road damage and maintain safety.
2. When should you perform a pre-trip inspection?
A) Once a month
B) Before the first trip of the day
C) Before driving each vehicle
D) Only if the vehicle seems unsafe
Rationale: Pre-trip inspections ensure mechanical safety and compliance
before every drive.
3. Which braking system is required on all commercial vehicles?
A) Hydraulic brakes only
B) Air brakes
C) Electric brakes
D) Disc brakes only
, Rationale: Commercial vehicles over 10,000 lbs are generally required to
have air brakes.
4. How far ahead should you signal before turning?
A) 25 feet
B) 50 feet
C) 75 feet
D) 500 feet
Rationale: Signaling 500 feet in advance allows sufficient time for other
drivers to react.
5. What is the primary purpose of the CDL road test?
A) To test your knowledge of truck weight limits
B) To see how fast you can drive
C) To ensure you can safely operate a commercial vehicle
D) To test your map-reading skills
Rationale: The road test evaluates safe vehicle handling, turns, and
emergency maneuvers.
6. Which factor most affects stopping distance?
A) Engine size
B) Tire color
C) Vehicle weight
D) Fuel type
Rationale: Heavier vehicles require more distance to stop, especially when
fully loaded.
7. What should you do if your vehicle starts to skid?
A) Slam on the brakes
B) Steer in the direction of the skid
C) Turn opposite the skid
D) Accelerate to regain control
Rationale: Steering into the skid helps regain traction and control.
, 8. When backing a commercial vehicle, the safest practice is to:
A) Use mirrors only
B) Have a spotter if possible
C) Look forward while reversing
D) Back as fast as possible
Rationale: A spotter reduces blind spot risks and prevents collisions.
9. What is a common symptom of brake fade?
A) Increased braking efficiency
B) Longer stopping distances
C) Decreased engine RPM
D) Tire slippage
Rationale: Brake fade occurs when brakes overheat, reducing stopping
power.
10.How often should you check your mirrors while driving on the highway?
A) Every 10 minutes
B) Every 5–8 seconds
C) Once per mile
D) Only before lane changes
Rationale: Frequent mirror checks help monitor traffic and avoid collisions.
11.When driving in fog, you should use:
A) High beams
B) Low beams
C) Hazard lights only
D) No lights
Rationale: Low beams reduce glare and improve visibility in fog.
12.Cargo should be inspected:
A) Once a week
B) Before the trip and after every break
C) Only at the loading dock
D) Only when unloading
Rationale: Regular inspections ensure secure cargo and prevent accidents.
CLASS A PRACTICE EXAM QUESTIONS
AND CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2026 Q&A
| INSTANT DOWNLOAD PDF
1. What is the maximum allowable weight on a single axle for a Class A
commercial vehicle?
A) 10,000 lbs
B) 20,000 lbs
C) 34,000 lbs
D) 40,000 lbs
Rationale: Federal regulations limit a single axle to 34,000 lbs to prevent
road damage and maintain safety.
2. When should you perform a pre-trip inspection?
A) Once a month
B) Before the first trip of the day
C) Before driving each vehicle
D) Only if the vehicle seems unsafe
Rationale: Pre-trip inspections ensure mechanical safety and compliance
before every drive.
3. Which braking system is required on all commercial vehicles?
A) Hydraulic brakes only
B) Air brakes
C) Electric brakes
D) Disc brakes only
, Rationale: Commercial vehicles over 10,000 lbs are generally required to
have air brakes.
4. How far ahead should you signal before turning?
A) 25 feet
B) 50 feet
C) 75 feet
D) 500 feet
Rationale: Signaling 500 feet in advance allows sufficient time for other
drivers to react.
5. What is the primary purpose of the CDL road test?
A) To test your knowledge of truck weight limits
B) To see how fast you can drive
C) To ensure you can safely operate a commercial vehicle
D) To test your map-reading skills
Rationale: The road test evaluates safe vehicle handling, turns, and
emergency maneuvers.
6. Which factor most affects stopping distance?
A) Engine size
B) Tire color
C) Vehicle weight
D) Fuel type
Rationale: Heavier vehicles require more distance to stop, especially when
fully loaded.
7. What should you do if your vehicle starts to skid?
A) Slam on the brakes
B) Steer in the direction of the skid
C) Turn opposite the skid
D) Accelerate to regain control
Rationale: Steering into the skid helps regain traction and control.
, 8. When backing a commercial vehicle, the safest practice is to:
A) Use mirrors only
B) Have a spotter if possible
C) Look forward while reversing
D) Back as fast as possible
Rationale: A spotter reduces blind spot risks and prevents collisions.
9. What is a common symptom of brake fade?
A) Increased braking efficiency
B) Longer stopping distances
C) Decreased engine RPM
D) Tire slippage
Rationale: Brake fade occurs when brakes overheat, reducing stopping
power.
10.How often should you check your mirrors while driving on the highway?
A) Every 10 minutes
B) Every 5–8 seconds
C) Once per mile
D) Only before lane changes
Rationale: Frequent mirror checks help monitor traffic and avoid collisions.
11.When driving in fog, you should use:
A) High beams
B) Low beams
C) Hazard lights only
D) No lights
Rationale: Low beams reduce glare and improve visibility in fog.
12.Cargo should be inspected:
A) Once a week
B) Before the trip and after every break
C) Only at the loading dock
D) Only when unloading
Rationale: Regular inspections ensure secure cargo and prevent accidents.
