District of Columbia CDL Practice Test 2026 & DC DMV Rules
Prepare for your commercial driver's license with the official District of Columbia exam curriculum. TruckerPass combines the 985 federal FMCSA questions with District of Columbia-specific commercial vehicle limits, air brake testing, and the 2026 Modernized Pre-Trip inspection.
DC Federal Security Corridors & Tight Urban Navigation
- Commercial vehicles over 26,000 lbs are barred from residential streets without explicit local delivery bills of lading.
- Tunnel and bridge restrictions: commercial vehicles are barred from the Center Leg Freeway tunnel and National Mall historic underpasses.
- HazMat placarded transport through the District requires strict adherence to designated hazardous material routing around the Capitol perimeter.
- DC DMV administers the standard federal 50-question knowledge exam requiring 80% (40 correct).
Official District of Columbia Test Format
- Licensing Agency: District Department of Motor Vehicles (DC DMV)
- General Knowledge: 50 questions, 80% to pass (at least 40 correct).
- Air Brakes Endorsement: 25 questions, 80% to pass (required for air-equipped rigs).
- Combination Vehicles: 20 questions, 80% to pass (Class A tractor-trailers).
- Modernized Pre-Trip Inspection: 4-Zone component walkaround + 4-Step air brake test.
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