District of Columbia CDL Study Guide
The District of Columbia issues both intrastate and interstate Commercial Driver Licenses through the DC DMV. Most testing happens at the Deanwood Road Test/CDL Services Office. The DC CDL Manual is published on dmv.dc.gov and covers all knowledge test topics and endorsements.
Key District of Columbia numbers
- Minimum age (intrastate): 18
- Minimum age (interstate or hazmat): 21
- CLP hold before skills test: at least 14 days
- General Knowledge passing score: 80%
- General Knowledge test: ~50 questions
- Air Brakes test: ~25 questions (required if your vehicle has air brakes)
- Combination Vehicles test: ~20 questions (required for Class A)
Topics on the District of Columbia General Knowledge test
- Vehicle inspection (pre-trip, en-route, post-trip)
- Driving safely (speed management, space management, hazard perception)
- Transporting cargo safely
- Air brakes (if your vehicle is air-braked)
- Combination vehicles (Class A)
If you fail a test
If you fail a DC CDL knowledge test, you must wait three calendar days. You can retake the test on the fourth day. Skills test retakes require rescheduling and paying the skills test fee again.
Frequently asked questions
What is the minimum age for a DC CDL?
18 for an intrastate CDL inside the District. You must be 21 to drive interstate or to carry hazardous materials.
Where do I take CDL tests in DC?
At the Deanwood Road Test/CDL Services Office. Bring all required documents and be ready to pay by card.
How much does a DC CDL cost?
$78 for the CLP, $117 for the CDL, $10 per knowledge test, $10 for the skills test, and $20 for each endorsement.
How long must I hold a DC CLP before the skills test?
At least 14 days, which matches the federal minimum.
Does DC require Entry-Level Driver Training?
Yes. First-time Class A or B applicants and first-time H, P, or S endorsements must complete ELDT from an FMCSA-registered provider.
What happens if I fail the CDL knowledge test in DC?
You must wait three calendar days and can retake the test on the fourth day.
Free practice
Start a District of Columbia General Knowledge quiz →
Sources: DC DMV Commercial Driver License DC DMV CDL Learner Permits DC DMV CDL Eligibility and Documentation DC DMV CDL Knowledge Tests