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CDL Knowledge Test Sections
Select a section to start practicing. Each section requires 80% to pass.
General Knowledge
Core CDL knowledge required for all license classes. Covers basic vehicle operation, safety regulations, and driving procedures.
50 questions
ListenPass: 80%
Air Brakes
Required if your vehicle has air brakes. Covers inspection, operation, and safe use of air brake systems.
25 questions
ListenPass: 80%
Combination Vehicles
Required for Class A CDL. Covers coupling/uncoupling, weight limits, and handling combination vehicles.
20 questions
ListenPass: 80%
Hazardous Materials
Required for HazMat (H) endorsement. Covers placarding, handling, and federal regulations for dangerous goods.
30 questions
ListenPass: 80%
Doubles and Triples
Required for Doubles/Triples (T) endorsement. Covers coupling, uncoupling, and special driving considerations.
20 questions
ListenPass: 80%
Tanker Vehicles
Required for Tank (N) endorsement. Covers liquid surge, inspection, and safe operation of tank vehicles.
20 questions
ListenPass: 80%
Passenger Transport
Required for Passenger (P) endorsement. Covers loading, safety announcements, and emergency procedures.
20 questions
ListenPass: 80%
School Bus
Required for School Bus (S) endorsement. Covers student safety, railroad crossing procedures, and emergency evacuation.
20 questions
ListenPass: 80%
Pre-Trip Inspection
Learn the systematic pre-trip inspection procedure required before every CDL driving shift.
10 questions
ListenPass: 80%
Elective25 min
State Rules
Separate selected-state practice for local DMV rules and federal/state differences.
Core10 min
ELDT / TPR Requirements
Federal Entry-Level Driver Training and Training Provider Registry requirements.
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