Georgia CDL Combination Vehicles Practice Test

The Georgia CDL Combination Vehicles test is a multiple-choice knowledge test you take for your commercial learner's permit. Georgia Department of Driver Services (DDS) says you need 80% to pass (source).

Last updated Oct 15, 2026. FirstTry CDL is a CDL permit test prep site by Hive Asset Group, LLC.

By Scott Wilder, Editor

Last reviewed against the Georgia CDL manual on October 15, 2026

Scott Wilder on X | scottwilderhq.com

FirstTry CDL is a CDL permit test prep site by Hive Asset Group, LLC. It offers free exam-style practice tests built from the official CDL manual. FirstTry CDL is not affiliated with any DMV, FMCSA or government agency. Practice questions are exam-style questions built from the official CDL manual, not actual test questions.

Georgia CDL permit facts

What	What Georgia says	Source
Combination Vehicles pass mark	80%	Official page
CLP fee	$10	Official page
CLP validity	365 days (for permits issued on or after July 1, 2021)	Official page
Knowledge test retest wait	2 days after the first failure and any later failure	Official page
Test languages	You must be able to read and understand English, and all documents must be in English. The DDS manual says road signs and driving tests are in English only. Which languages the CDL knowledge tests come in is not stated on the official pages.	Official page

20 question Combination Vehicles practice test

1. Your trailer is not lining up while you back. What should you do?
1. A. Keep backing and correct with the hand valve
2. B. Push on until the trailer lines up on its own
3. C. Switch to high reverse gear for more control
4. D. Pull forward to re-position, then back again
Show answer
Answer: D. Pull forward to re-position, then back again
The manual says to make pull-ups to re-position your vehicle as needed.
From the official CDL manual, section 6.1.7.
2. What do you do with the wheel chocks in the last step of coupling?
1. A. Leave them under the trailer wheels
2. B. Throw them on the ground behind the trailer
3. C. Hang them on the landing gear
4. D. Remove them and store them in a safe place
Show answer
Answer: D. Remove them and store them in a safe place
The last step is to remove the wheel chocks and store them in a safe place.
From the official CDL manual, section 6.4.1.
3. With air supplied to the trailer, what should the air pressure gauge show you?
1. A. The weight of the trailer
2. B. The speed of the tractor
3. C. Signs of major air loss
4. D. The fifth wheel height
Show answer
Answer: C. Signs of major air loss
You check the gauge for signs of major air loss.
From the official CDL manual, section 6.4.1.
4. Why do you check the cargo before you couple to a trailer?
1. A. To weigh the cargo
2. B. Coupling can make the cargo move, so it must be secured
3. C. To count the pieces of cargo
4. D. To check the cargo papers
Show answer
Answer: B. Coupling can make the cargo move, so it must be secured
Cargo must be secured against movement caused by coupling the tractor to the trailer.
From the official CDL manual, section 6.4.1.
5. What does the tractor protection valve do?
1. A. Keeps the trailer wheels from locking up
2. B. Sends more air to the trailer in a hard stop
3. C. Keeps air in the tractor brake system if the trailer breaks away or leaks badly
4. D. Drains water from the trailer air tanks
Show answer
Answer: C. Keeps air in the tractor brake system if the trailer breaks away or leaks badly
This valve protects the tractor's air supply from a trailer problem.
From the official CDL manual, section 6.2.2.
6. How does ABS relate to the normal brakes on your vehicle?
1. A. It works only when the normal brakes fail
2. B. It replaces the normal brakes
3. C. It is an addition to the normal brakes
Show answer
Answer: C. It is an addition to the normal brakes
ABS is an addition to your normal brakes.
From the official CDL manual, section 6.3.2.
7. Only your trailer has ABS. How does this affect your control during braking?
1. A. It gives you no extra control
2. B. It gives you more control
3. C. It makes the brakes weaker
Show answer
Answer: B. It gives you more control
ABS on only the trailer, or only one axle, still gives you more control.
From the official CDL manual, section 6.3.2.
8. When the full weight of the trailer is on the tractor, what clearance do you check at the trailer nose?
1. A. Between the top of the tractor tires and the nose of the trailer
2. B. Between the kingpin and the cab roof
3. C. Between the trailer tires and the landing gear
4. D. Between the glad hands and the bumper
Show answer
Answer: A. Between the top of the tractor tires and the nose of the trailer
You check clearance between the top of the tractor tires and the trailer nose.
From the official CDL manual, section 6.4.1.
9. A lightly loaded combination locks its wheels in a hard stop. What can happen?
1. A. The trailer can swing out and the tractor can jackknife
2. B. The trailer will straighten out on its own
3. C. The tractor protection valve will open
4. D. The cargo will shift forward and help traction
Show answer
Answer: A. The trailer can swing out and the tractor can jackknife
With poor traction, a trailer can swing out and a tractor can jackknife very quickly.
From the official CDL manual, section 6.1.3.
10. On some fifth wheels, how is the safety latch put in place?
1. A. It moves into place by itself every time
2. B. By hand
3. C. With a wrench
4. D. With the tractor brakes
Show answer
Answer: B. By hand
On some fifth wheels the catch must be put in place by hand.
From the official CDL manual, section 6.4.1.
11. After you inspect the coupling, what do you do with the electrical cord?
1. A. Leave it hanging loose
2. B. Plug it into the trailer and fasten the safety catch
3. C. Tie it to the landing gear
4. D. Connect it to the air-line
Show answer
Answer: B. Plug it into the trailer and fasten the safety catch
The cord is plugged into the trailer and the safety catch is fastened.
From the official CDL manual, section 6.4.1.
12. During a walk-around, where should the lower fifth wheel locking jaws be?
1. A. Around the head of the kingpin
2. B. Around the shank of the kingpin, not the head
3. C. Around the glide plate
4. D. Open, with the release arm up
Show answer
Answer: B. Around the shank of the kingpin, not the head
Jaws on the shank hold the trailer securely.
From the official CDL manual, section 6.5.1.
13. Where is the yellow ABS malfunction lamp found on a trailer?
1. A. On the right side, near the landing gear
2. B. On the nose of the trailer, near the glad hands
3. C. Inside the tractor cab only
4. D. On the left side, at the front or rear corner
Show answer
Answer: D. On the left side, at the front or rear corner
The manual places the lamp on the left side of the trailer, front or rear corner.
From the official CDL manual, section 6.3.1.
14. What should you see on the landing gear during the walk-around?
1. A. Half raised so it clears the ground
2. B. Lowered with the crank removed
3. C. Raised, with the crank handle left on the ground
4. D. Fully raised, undamaged, with the crank handle in place and secured
Show answer
Answer: D. Fully raised, undamaged, with the crank handle in place and secured
This is what the manual lists for the landing gear.
From the official CDL manual, section 6.5.1.
15. How should the trailer height compare with the fifth wheel when you back under?
1. A. High enough that the tractor does not touch it
2. B. Level with the fifth wheel plate
3. C. As high as the landing gear will go
4. D. Low enough that the tractor raises it slightly
Show answer
Answer: D. Low enough that the tractor raises it slightly
The trailer should be raised slightly by the tractor as you back under.
From the official CDL manual, section 6.4.1.
16. What causes more than half of truck driver deaths in crashes?
1. A. Rear-end collisions
2. B. Head-on collisions
3. C. Fires after a crash
4. D. Truck rollovers
Show answer
Answer: D. Truck rollovers
Rollovers account for more than half of truck driver deaths in crashes.
From the official CDL manual, section 6.1.1.
17. You cross the service and emergency air-lines. What happens to the trailer spring brakes?
1. A. They do not release, because air does not charge the trailer tanks
2. B. They release normally
3. C. They release only after the engine is shut off
Show answer
Answer: A. They do not release, because air does not charge the trailer tanks
Supply air goes to the service line, so the tanks are not charged and the spring brakes stay on.
From the official CDL manual, section 6.2.5.
18. You are coupling and your tractor has a sliding fifth wheel. What must you make sure of?
1. A. It is slid all the way forward
2. B. It is slid all the way back
3. C. It is locked
4. D. It is unlocked so it can move
Show answer
Answer: C. It is locked
The manual says to make sure a sliding fifth wheel is locked.
From the official CDL manual, section 6.4.1.
19. Your truck has ABS. May you follow other vehicles more closely?
1. A. Yes, ABS always stops the truck sooner
2. B. No, ABS does not allow closer following
3. C. Yes, but only on dry roads
Show answer
Answer: B. No, ABS does not allow closer following
ABS will not let you drive faster, follow closer, or drive less carefully.
From the official CDL manual, section 6.3.2.
20. What is off-tracking?
1. A. The trailer drifting out of its lane on a straight road
2. B. The rear wheels following a different path than the front wheels in a turn
3. C. The trailer skidding when brakes lock
4. D. The tractor leaning in a high-speed turn
Show answer
Answer: B. The rear wheels following a different path than the front wheels in a turn
The manual calls this off-tracking or "cheating."
From the official CDL manual, section 6.1.6.

Georgia CDL Combination Vehicles questions

What score do you need to pass the Georgia CDL Combination Vehicles test?

Georgia says you need 80% to pass the Combination Vehicles test.

Is the Georgia CDL Combination Vehicles test the same as other states?

The Combination Vehicles test is built on the same federal knowledge standards in every state, so the topics match the CDL manual. Georgia uses its own handbook: https://dds.georgia.gov/media/12646/download

How much does a CDL permit cost in Georgia?

CLP fee: $10.

What languages is the Georgia CDL knowledge test offered in?

You must be able to read and understand English, and all documents must be in English. The DDS manual says road signs and driving tests are in English only. Which languages the CDL knowledge tests come in is not stated on the official pages.

Sources

https://dds.georgia.gov/media/12646/download
https://dds.georgia.gov/fees-and-terms
https://dds.georgia.gov/georgia-licenses-ids-and-permits/new-license-id-or-permit/how-do-i-cdl-license
Manual sections used in this test: 6.1.1; 6.1.3; 6.1.6; 6.1.7; 6.2.2; 6.2.5; 6.3.1; 6.3.2; 6.4.1; 6.5.1

Combination Vehicles practice test in nearby states