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All Service Centers, Adjudication, and Deanwood CDL are by "Appointment Only." DMV has extended the expiration date for DLs, IDs, vehicle registrations, inspections, ticket payments and ticket adjudication responses expiring Mar 1, 2020 -May 20, 2021 until 45 days after the health emergency ends.

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CDL Knowledge Tests

To get a DC DMV CDL, you must first take and pass all required knowledge tests to get a CDL learner permit with the class designation and endorsements that you need. All knowledge tests are in English only.

You must download and study the DC DMV CDL Manual to learn what you will need to know for each test you must take. The CDL Manual is available at: DC DMV CDL Manual [PDF]

To take the knowledge tests, you must go to the DC DMV Deanwood Commercial Driver License Center with all of the required personal documentation. Details on documentation are available at: CDL Eligibility and Documentation

You will need an appointment to visit the Deanwood Center. Information on the DC DMV Deanwood Commercial Driver License Center is available at: Deanwood Commercial Driver License Center

You will have to pay a fee to take the knowledge tests, whether you pass or fail. Information on DC DMV fees is available at: DC DMV Fees

If you fail…

If you fail the CDL knowledge test, you must wait 3 calendar days before you are eligible to take it again on the fourth day. For example, if you take and fail the knowledge test on Tuesday, you will not be able to retake the test until Saturday. If you fail the CDL knowledge test 6 times within a 12-month period, you will not be allowed to take the 7th test until 12 months after you fail the 1st test. Please be sure you have studied the CDL Manual before you take the test(s).

If you exceed the time limit for the test you are taking, you will fail the test.

Testing time limits

CDL General Knowledge – 90 minutes

CDL Endorsements – 60 minutes

Listed below are the required knowledge tests for each CDL CMV class and endorsement.

Required Knowledge Tests for Class A

  • General Commercial
  • Combination
  • Airbrakes

Required Knowledge Tests for Class A endorsements

  • T – Double/Triple Trailers
  • P – Passenger
  • S – School Bus
  • H – Hazardous Material
  • N – Tank

Required Knowledge Tests for Class B

  • General Commercial
  • Airbrakes

Required Knowledge Tests for Class B endorsements

  • P – Passenger
  • S – School Bus
  • H – Hazardous Material
  • N – Tank

Required Knowledge Tests for Class C

  • General Commercial

Required Knowledge Tests for Class C endorsements

  • P – Passenger
  • S – School Bus
  • H – Hazardous Material

Endorsements for Hazardous Materials (H) and Tank (N) do not require a road skills test. Endorsements for H, N, and X (Hazardous Material and Tankers) may not be obtained prior to the issuance of the appropriate DC DMV REAL ID CDL (Class A, B or C).

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