CDL guides
Practice questions
- CDL General Knowledge Practice TestFree CDL General Knowledge practice questions with explained answers on inspections, space management, speed, hazards, warning devices and cargo.
- CDL Air Brakes Practice TestFree CDL air brakes practice questions with explained answers on air pressure, warning signals, spring brakes, leakage rates and the air brake check.
- CDL Combination Vehicles Practice TestFree CDL Combination Vehicles practice questions with explained answers on coupling and uncoupling, rollover, off-tracking, trailer air brakes and jackknifes.
- CDL Hazmat Endorsement Practice TestFree CDL Hazardous Materials (H endorsement) practice questions with explained answers on hazard classes, placards, shipping papers, loading and emergencies.
- CDL Doubles and Triples Practice TestFree CDL doubles and triples (T endorsement) practice questions with explained answers on coupling twin trailers, rollover, converter dollies and air checks.
- CDL Tank Vehicles (Tanker) Practice TestFree CDL tank vehicle (N endorsement) practice questions with explained answers on liquid surge, baffles, smooth bore tanks, outage and rollover risk.
- CDL Passenger Endorsement Practice TestFree CDL passenger (P endorsement) practice questions with explained answers on bus inspections, loading, railroad crossings, prohibited cargo and safe driving.
- CDL School Bus Practice TestFree CDL school bus (S endorsement) practice questions with explained answers on danger zones, mirrors, loading and unloading, railroad crossings and evacuation.
About the exam
- CDL Permit Test GuideHow the CDL knowledge tests work: General Knowledge, Air Brakes, Combination Vehicles and Hazmat, question counts, the 80% passing score, the CLP and ELDT.
- CDL Class A vs Class B vs Class CThe difference between Class A, Class B and Class C commercial driver's licenses, with weight limits from federal rules and examples of each vehicle.
- CDL Endorsements and Restrictions ExplainedWhat each CDL endorsement allows (hazmat, tank, passenger, school bus, doubles/triples) and the common CDL restrictions, with the tests each one needs.