- The General Commercial knowledge test is 90 minutes, and federal rules require at least 80% to pass.
- Testing happens in person and English-only at the Deanwood Road Test/CDL Services Office.
- A CLP costs $78, knowledge tests are $10 each, and the CLP is valid one year with no renewal.
- Fail six times in 12 months and your seventh attempt is delayed until 12 months after the first failure.
Quick Facts Snapshot
This cheat sheet condenses everything a candidate needs before walking into the Deanwood Road Test/CDL Services Office to sit for the District of Columbia CDL Permit Test (DC-CDL). Bookmark it, print it, or keep it open on your phone the night before your appointment. For a deeper walkthrough of each of these facts, see the full DC-CDL Study Guide 2026, and if you want to gauge how tough the test actually feels in practice, read How Hard Is the DC-CDL Exam?
- Core test: General Commercial knowledge test (90-minute limit)
- Class A add-ons: Combination Vehicles and Air Brakes knowledge tests
- Endorsements: Added tests as needed for the specific endorsement sought
- Passing score: At least 80%, per federal CDL testing rules
- Manual: 2005 CDL Testing System, July 2014 edition (the official linked reference)
Testing Format at Deanwood
Every DC-CDL knowledge test is administered on-site at Deanwood, not at a satellite DMV location and not through a third-party testing vendor. That matters for scheduling - you cannot walk into just any DC DMV service center and expect to sit for the General Commercial test. Plan your day around a trip to Deanwood specifically, and check DC-CDL Exam Dates 2026 for guidance on booking a slot before you show up.
The General Commercial knowledge test is timed at 90 minutes. Class A applicants don't stop there - they also need to pass the Combination Vehicles test and the Air Brakes test, since most Class A equipment includes air brake systems. If you're pursuing a specific endorsement (like tank vehicles or hazardous materials), an additional endorsement-specific knowledge test is layered on top. A complete breakdown of how each of these knowledge areas is weighted and structured lives in the DC-CDL Exam Domains 2026 guide.
Key Takeaway
Because every test is English-only and in-person, there's no ability to test remotely, request a translated version, or reschedule at a different office. Build travel time to Deanwood into your test-day plan.
Fee Schedule at a Glance
DC-CDL fees are itemized separately for knowledge tests, permit issuance, licensing, endorsements, and skills testing. Card payments carry a 2.5% service fee, so budgeting a small buffer for that surcharge avoids surprises at the counter. For the full context behind each line item, see DC-CDL Certification Cost 2026.
| Item | Fee |
|---|---|
| CDL knowledge test (each) | $10 |
| Commercial Learner's Permit (CLP) | $78 |
| First or renewed CDL | $117 |
| Each endorsement | $20 |
| Road skills test | $10 |
| Card payment surcharge | 2.5% of transaction |
Note that the CLP itself is not renewable. It's valid for exactly one year from issuance, so timing your skills test and full CDL application within that window is essential - there's no fallback renewal fee to fall back on if it lapses.
Eligibility Checklist
Before you can even schedule a knowledge test, DC-CDL applicants need to satisfy a documentation checklist. Miss one item and you'll likely be turned away at the counter, wasting a trip to Deanwood. The full eligibility breakdown is covered in DC-CDL Requirements 2026, but here's the condensed version:
- A valid DC noncommercial driver license
- Identity and residency documentation
- A 10-year driving history record
- Lawful-status documentation
- DOT medical certification, submitted electronically by your medical examiner (not by you)
- Entry-Level Driver Training (ELDT) completion, required for covered first-time licenses, license upgrades, or new endorsements
- For new CLP applicants: completion of the approximately 15-minute human-trafficking-awareness training
Knowledge Domains You'll Face
The heart of DC-CDL preparation is mastering the content areas tested at Deanwood. Class A candidates face three separate knowledge tests, while other applicants may need only the General Commercial test plus any endorsements. Study each domain as its own unit rather than cramming everything together - a strategy detailed further in the domains guide linked above.
General Commercial
This is the foundational knowledge test every CDL applicant takes. It covers the rules, safety practices, and vehicle-handling knowledge common to all commercial vehicle operation.
- 90-minute time limit - pace yourself rather than rushing or lingering
- Minimum 80% score required to pass, per federal CDL rules
- Foundational for every other CDL knowledge test you'll take afterward
Combination Vehicles
Required for Class A applicants. Focuses on the additional handling, coupling, and safety knowledge specific to operating combination (tractor-trailer style) vehicles.
- Tested separately from the General Commercial test
- Directly tied to the vehicle class you intend to operate
Air Brakes
Also required for most Class A applicants, since combination vehicles commonly use air brake systems. Skipping mastery here risks a restriction on your CDL that limits what equipment you can legally drive.
- A separate knowledge test from Combination Vehicles
- Failure to pass can result in an air-brake restriction on your license
Endorsements
Added on an as-needed basis depending on the type of freight or vehicle configuration you plan to operate. Each endorsement requires its own knowledge test and its own $20 fee.
- Not required unless your job or vehicle type demands it
- Stack endorsement study after you've secured your base CDL knowledge
To understand exactly what "passing" looks like on each of these, review DC-CDL Passing Score 2026, and if you want to know how outcomes generally trend across test-takers, see DC-CDL Pass Rate 2026.
Retest Rules and Timing
DC-CDL has strict retest spacing built in, and it's one of the most commonly overlooked pieces of the process. If you fail a knowledge test, you must wait three calendar days before retesting - meaning you can retest on the fourth day, not the day after.
Key Takeaway
Six failures within any 12-month window trigger a much longer penalty: your seventh attempt is delayed until a full 12 months after your very first failure. Treat every attempt as one you intend to pass.
This retest structure is exactly why serious preparation using our full practice test platform before your first attempt matters more than it might seem. A single unprepared attempt can cost you days of waiting, and repeated failures can cost you nearly a year. Running through realistic practice questions on our practice test site before ever stepping into Deanwood is the cheapest insurance against that outcome.
Last-Week Review Plan
If your Deanwood appointment is roughly a week out, structure your final review around the domains you'll actually be tested on rather than generic study advice. This short plan assumes a Class A candidate facing all three knowledge tests.
General Commercial fundamentals
- Work through the 2005 CDL Testing System manual sections covering general safe driving practices
- Take timed practice sets to simulate the 90-minute limit
Combination Vehicles
- Focus on coupling/uncoupling procedures and combination-specific hazards
- Drill weak spots identified from Days 1-2 review
Air Brakes and endorsements
- Study air brake system components and inspection steps in detail
- Add any endorsement-specific content if applicable to your job target
Full review and logistics
- Confirm ELDT and medical certification are on file before your appointment
- Re-take full-length practice tests across all required domains
For a longer-horizon version of this plan built around multiple weeks instead of one, the full DC-CDL Study Guide 2026 walks through pacing in more depth.
Who Hires DC-CDL Holders
A DC-CDL opens the door to commercial driving roles across freight, delivery, passenger transport, and municipal services within the District and the surrounding region. Because DC's commercial driving workforce serves a dense urban market alongside regional freight lanes, employers span local delivery fleets, regional trucking companies, and public-sector transportation operations. For a closer look at where DC-CDL holders actually find work, see DC-CDL Jobs, and if you're weighing whether the licensing process is worth the time and fees involved, Is the DC-CDL Certification Worth It? lays out the tradeoffs. Earnings expectations vary by employer and vehicle class, and a broader discussion of that is available in the DC-CDL Salary Guide 2026.
Frequently Asked Questions
All DC-CDL knowledge testing is administered in person at the Deanwood Road Test/CDL Services Office, run by the DC Department of Motor Vehicles. There is no remote or online testing option.
It has a 90-minute time limit, and you need at least 80% correct to pass, per federal CDL testing rules.
You must wait three calendar days and can retest on the fourth day. If you accumulate six failures within 12 months, your seventh attempt is delayed until 12 months after your first failure.
A CLP is valid for one year from issuance and is nonrenewable, so you need to complete your skills test and CDL issuance within that window.
Yes. In addition to the General Commercial knowledge test, Class A applicants must also pass Combination Vehicles and Air Brakes knowledge tests, plus any endorsement tests their job requires.
Keep this cheat sheet handy as a final checkpoint before your Deanwood appointment, and pair it with realistic timed practice on our practice test platform so nothing on test day catches you off guard.