Free, full New Jersey CDL general knowledge test practice right here in your browser — real exam format (50 questions, 80% to pass), diagnostic and adaptive modes, spaced-repetition review, and a readiness dashboard. No signup, no paywall — your progress is saved automatically on this device. Matched to the official MVC knowledge exam.
When pulling doubles or triples, the crack-the-whip effect means:
B. The last trailer is most likely to turn over because rearward motion is amplified — Steering motions amplify toward the rear, so the last trailer can flip in a quick move; drive smoothly and slow down to prevent it.
After stopping on the shoulder of a two-lane road, you should place a warning triangle:
D. About 10 feet behind, 100 feet behind, and 100 feet ahead of the vehicle — On a two-lane road, place triangles roughly 10 and 100 feet behind and 100 feet ahead so traffic from both directions is warned.
After unloading passengers at a destination, what must a bus driver do before driving away?
B. Scan all mirrors and check around the bus to ensure no passengers remain near the vehicle — Before pulling away after unloading, the driver must check all mirrors and look around the bus to confirm no passengers (especially children) are in a danger zone around the vehicle.
When loading or unloading explosives or flammable materials, smoking is prohibited within:
B. 25 feet — No one may smoke or carry a lighted smoking item within 25 feet of a vehicle that contains explosives, oxidizers, or flammables.
You should check cargo and securing devices after driving how many miles?
C. 25 miles, then every 150 miles or 3 hours — Check cargo within the first 25 miles, then every 150 miles or every 3 hours of driving, whichever comes first.
If a trailer's wheels lock up and it begins to swing out (trailer jackknife), you should:
C. Release the brakes to let the trailer wheels roll and regain traction — Releasing the brakes lets the locked trailer wheels start rolling again, which restores traction and helps the trailer fall back in line.
Property-carrying drivers must take a 30-minute break after how many hours of driving time?
C. 8 hours — A 30-minute break is required after 8 cumulative hours of driving time, satisfied by any non-driving period of at least 30 minutes.
CDL safety scenario 4: Before backing a tractor-trailer, what is the safest first step?
C. Get out and inspect the path for hazards — Get out and inspect the path for hazards. Commercial drivers are expected to manage this situation before it becomes a crash risk. The CDL manual emphasizes controlling the vehicle, inspecting safety-critical systems, and correcting hazards promptly.
CDL safety scenario 42: Why does liquid surge make tanker driving harder?
A. The moving liquid can push the vehicle after you brake or turn — The moving liquid can push the vehicle after you brake or turn. Commercial drivers are expected to manage this situation before it becomes a crash risk. The CDL manual emphasizes controlling the vehicle, inspecting safety-critical systems, and correcting hazards promptly.
The adverse driving conditions exception generally allows a driver to:
C. Extend the maximum driving window by up to 2 hours when unexpected bad weather or conditions arise — When unforeseen weather or traffic conditions occur, a driver may extend driving and the window by up to 2 hours to reach a safe stop.
The New Jersey CDL general knowledge test has 50 questions, and you need 80% to pass — at least 40 correct answers. The practice tests on this page use the same format. The 80% passing score is a federal FMCSA standard used by every state.
80%. You can miss at most 10 of the 50 questions. The readiness dashboard on this page tracks whether you're consistently scoring above that bar.
In New Jersey, driver licensing is handled by the Motor Vehicle Commission (MVC), so you'll often see the exam called the MVC CDL general knowledge test. The practice tests on this page match the official MVC knowledge exam format.
Yes. Every practice test on this page and everything in the DMVPrep iPhone app is free — no ads, no paywall, no account.
Federal motor carrier safety regulations (FMCSA) — the same rules every state's CDL exam is drawn from. Every question in the DMVPrep app cites the regulation or handbook section it comes from.
Yes — the DMVPrep app includes all 3,745+ questions in Spanish, and the whole app works in Spanish.