CDL DOUBLES TRIPLES PRACTICE TEST DISTRICT OF COLUMBIA

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Safely pulling double and triple trailers requires knowledge and skill. If you want to pull double or triple trailers, you must add the Doubles/Triples (T) endorsement to your Class A CDL. The District of Columbia doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The DC CDL doubles triples test covers the following sections of the District of Columbia CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this DC CDL practice test now to prepare for the actual test!
1. When the spring brakes are on, you should:
not push the brake pedal down.
press the accelerator.
exceed the posted speed limit.
pump the brakes.
2. When more cargo is piled up in a truck, the center of gravity moves:
higher up from the road.
to the left side of the truck.
closer to the ground.
to the right side of the truck.
3. Having ABS on only the trailer:
is very dangerous.
makes the trailer more likely to swing out.
still gives you more control over your vehicle during braking.
makes the trailer more likely to roll over.
4. Emergency brakes must be held on by:
mechanical force.
hydraulic pressure.
air pressure.
dynamic pressure.
5. If you must drive slowly, how should you alert following drivers?
Help them out by signaling when it is safe to pass
Use your emergency flashers if it is legal
Turn on your taillights
Flash your brake lights
6. Truck tractors with air brakes built after March 1, 1997, are required to be equipped with:
anti-lock brakes.
hydraulic brakes.
a rear backup camera.
GPS
7. Watch out for black ice:
any time the temperature is below freezing and the road looks wet.
when it is snowing.
right after it starts to rain.
when the temperature is above freezing and the road is dry.
8. When driving a double or triple:
all trailers should have the same weight.
the more heavily loaded trailer should be in the rear.
the more heavily loaded trailer should be directly behind the tractor.
the lighter trailer should be directly behind the tractor.
9. If you're feeling tired while driving you should:
drink coffee.
stop driving and get some rest.
eat something.
increase your speed to get to your destination quicker.
10. If an item placed on a flatbed trailer is 7 feet long, it should have __ tie-downs.
3
7
1
2
 
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Frequently Asked Questions

To obtain a driver's license in the District of Columbia, teens between 16 to 20 are enrolled in the Gradual Rearing of Adult Drivers (GRAD) Program:

  • If you are at least 16 years old, you can obtain a learner permit.
  • If you are 16 ½ and have held a learner permit for at least 6 months without traffic violations, you are ready for the provisional driver license.
  • If you are 17 years old and have held a provisional driver license for at least 6 months, you can obtain a full license with conditions (until you turn 18).

At 21 years old, you are released from the GRAD program, and you may immediately schedule a road test.

To schedule and take the DMV written test in the District of Columbia, you have three options:

  1. Select a DC DMV Service Center and schedule an appointment in person at takemydrivingtest.com/dc. Choose a location, date, and time for your exam.
  2. Select a Test Proctoring Center.
  3. If you are between 16 and 20 years old you can choose to take the exam online at home. Upon completing the virtual knowledge test, you'll promptly receive your test results. If you pass, simply visit any DC DMV Office within 14 business days to obtain your learner permit.

DC DMV requires you to bring specific documents to verify your eligibility for a class D driver's license: 

  • Proof of identity and age.
  • Proof of lawful presence.
  • Proof of Social Security Number.
  • Two proofs of district residency.
  • Parental Consent Form (if you are under 18 years old).
  • Medical/Eye Form (If you have a particular condition or if you're above 70 years).

Refer to the official DC Document Verification Guide for the complete list of acceptable documents.

The DMV written test in the District of Columbia is available in multiple languages, including English, Amharic, Arabic, Cantonese, French, German, Japanese, Korean, Mandarin, Portuguese, Russian, Spanish, Tagalog, Thai, and Vietnamese. Additionally, audio-assisted tests are provided for individuals who require assistance with reading.

To prepare for the DMV written test, you can refer to the official DC Driver's Handbook. The manual covers various information about road rules, traffic signs, and safe driving practices. Study carefully the different sections and test your knowledge with our free practice tests!

Learner permit:
  • Driving only with an instructor aged 21 or older (no passengers allowed).
  • Specific driving hour restrictions (from 6 am to 9 pm).
  • All occupants must wear seat belts.
  • Mobile phones cannot be used while driving.

Provisional license (16 ½ - 20 years old):
  • Driving alone with a maximum of one passenger aged 21 or older in the front seat, or with siblings/child.
  • Specific time restrictions:
- September to June (Sunday to Thursday from 6 am to 10:59 pm; Friday and Saturday from 6 am to 11:59 pm)
- July and August (from 6 am to 11:59 pm).
  • No driving for compensation (if under 18).
  • All occupants must wear seat belts.

Full license with conditions (under 18):
  • Same restrictions as the provisional license if you are a minor, but you are allowed to transport two passengers under 21.

Driving hour restrictions don't apply if you are accompanied by a holder of a valid driver's license aged 21 or older or for job, school, religious, or sport activities.


The DC instruction permit is valid for a period of two years for U.S. citizens and cannot be renewed. After its expiration, you will need to retake and pass the knowledge test again. During this period, practice to enhance your driving skills before the road test.

If you don't pass the DMV written test, you must wait 72 hours for a second try. If you fail six consecutive attempts, you will have to wait twelve months from the date of your initial test before retaking it. Sign up for DMV Premium and practice with extra tests to maximize the chance of passing!

DC CDL Doubles Triples Test

Number of questions: 20
Correct answers to pass:16
Passing score:80%
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