Washington DC General Knowledge Test
You'll need to know more than just federal regs — DC examiners ask about the 14th Street Bridge's no-idle zone and how to handle I-395's tight merges with a 40-foot trailer.
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50 questions, 60 minutes, 80% to pass. Start now and see exactly what the DC DMV test looks like.
Key Topics
- •Pre-trip inspection and air brakes
- •DC-specific traffic laws and no-idle zones
- •Cargo securement and emergency driving
About the Washington DC General Knowledge Test
Topics Covered
- ✓Vehicle inspection procedures — DC examiners want you to know the pre-trip checks for a rig that'll be squeezing through Georgetown's narrow streets.
- ✓Air brake basics — you'll face steep grades on the approach to the Key Bridge; you need to understand brake lag and stopping distance.
- ✓Cargo securement — DC's potholes on New York Avenue can shift a load fast; proper tie-downs aren't optional.
- + 3 more topics
📘 Study Tips & State Info
DC DMV examiners are no-nonsense. They've seen it all — drivers who memorized the federal book but can't explain how to handle a lane closure on the 14th Street Bridge. Focus on the practical stuff. When you study air brakes, picture yourself rolling up to a stoplight at the bottom of the I-395 ramp with a loaded dump truck. That's the mental model that helps.
One thing DC examiners emphasize: local knowledge. They'll ask about commercial vehicle restrictions on certain streets — like the ban on trucks over 10,000 lbs on Rock Creek Parkway. They also care about the DC no-idle law. You can't idle your diesel engine for more than 3 minutes in the District. That's on the test. So don't just skip to the federal sections — read the DC-specific addendum in the CDL manual.
Our practice test flags these local questions so you can spot them. Take it twice. First time to see where you're weak. Second time after you've reviewed. Aim for 90% on practice before you walk into the Brentwood DMV.
The DC DMV handles all CDL testing at two locations: the Brentwood Service Center (301 Rhode Island Ave NE) and the Georgetown Service Center (3270 M St NW). You need to make an appointment — walk-ins are not guaranteed. The test fee is $28 for the written knowledge test, payable by credit card or money order. No cash.
You'll need to bring your valid driver's license, Social Security card, proof of DC residency, and a valid Medical Examiner's Certificate (DOT physical). If you're applying for a CDL for the first time, you also need to provide proof of U.S. citizenship or lawful permanent residency. The test is offered in English only — no interpreter allowed. Appointments fill up fast, especially in summer. Book at least two weeks ahead.
One more thing: DC enforces the federal drug and alcohol clearinghouse rule. If you have a violation on your record, you won't get your CDL until you complete the return-to-duty process. The examiners check this before they let you take the test.
About the Washington DC General Knowledge Test
Washington DC isn't a typical state — it's a city of 700,000 people packed into 68 square miles. Every day, thousands of commercial trucks haul supplies to government buildings, hotels, and restaurants. The General Knowledge test here covers federal FMCSA rules, but DC examiners also throw in local twists like the no-idling laws on the 14th Street Bridge and the weight restrictions on Rock Creek Parkway.
You'll get 50 multiple-choice questions. You need 40 right to pass — that's 80%. The test covers safe vehicle inspections, basic air brake theory, cargo securement, and the rules of the road. DC doesn't have its own CDL manual; you use the federal one. But the DMV adds a few local questions about DC's unique traffic patterns and parking rules for commercial vehicles.
If you're planning to drive for a delivery company serving downtown hotels or a construction outfit working near the Capitol, you better know how to handle tight alleyways and rush hour on I-295. The test reflects that reality — it's not just textbook stuff. You'll need to think about how a 50-foot tractor-trailer navigates a left turn onto Pennsylvania Avenue without climbing the curb.
Our practice test simulates the real DC DMV experience. Same number of questions, same time limit. We include local context so you're not caught off guard by questions about the DC Circulator bus right-of-way or the ban on commercial vehicles in residential zones after 10 PM.
Topics Covered
Study Tips
DC DMV examiners are no-nonsense. They've seen it all — drivers who memorized the federal book but can't explain how to handle a lane closure on the 14th Street Bridge. Focus on the practical stuff. When you study air brakes, picture yourself rolling up to a stoplight at the bottom of the I-395 ramp with a loaded dump truck. That's the mental model that helps.
One thing DC examiners emphasize: local knowledge. They'll ask about commercial vehicle restrictions on certain streets — like the ban on trucks over 10,000 lbs on Rock Creek Parkway. They also care about the DC no-idle law. You can't idle your diesel engine for more than 3 minutes in the District. That's on the test. So don't just skip to the federal sections — read the DC-specific addendum in the CDL manual.
Our practice test flags these local questions so you can spot them. Take it twice. First time to see where you're weak. Second time after you've reviewed. Aim for 90% on practice before you walk into the Brentwood DMV.
Washington DC Specific Information
The DC DMV handles all CDL testing at two locations: the Brentwood Service Center (301 Rhode Island Ave NE) and the Georgetown Service Center (3270 M St NW). You need to make an appointment — walk-ins are not guaranteed. The test fee is $28 for the written knowledge test, payable by credit card or money order. No cash.
You'll need to bring your valid driver's license, Social Security card, proof of DC residency, and a valid Medical Examiner's Certificate (DOT physical). If you're applying for a CDL for the first time, you also need to provide proof of U.S. citizenship or lawful permanent residency. The test is offered in English only — no interpreter allowed. Appointments fill up fast, especially in summer. Book at least two weeks ahead.
One more thing: DC enforces the federal drug and alcohol clearinghouse rule. If you have a violation on your record, you won't get your CDL until you complete the return-to-duty process. The examiners check this before they let you take the test.