Free, full Florida 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 FLHSMV knowledge exam.
What is the maximum BAC allowed for CDL holders operating a commercial vehicle?
A. 0.04% — CDL holders face a stricter 0.04% BAC limit because commercial vehicles are heavier and harder to stop, making impairment far more dangerous. Even at 0.04% a driver can be charged with DUI regardless of how they feel.
What must a driver do when a HazMat incident occurs (leak or spill)?
C. Stop in a safe location away from public areas; stay upwind; warn others; call the emergency number on the shipping paper or 911; do not allow smoking or open flames — In a HazMat incident: stop safely away from buildings and public areas, stay upwind of any spill, warn other people away, do not allow smoking or open flames, and call 911 and the emergency contact number on the shipping paper.
What is the 'CHEMTREC' phone number used for?
B. To obtain emergency chemical information from chemical companies 24 hours a day during a HazMat emergency — CHEMTREC (1-800-424-9300) is a 24-hour emergency service operated by the American Chemistry Council that provides immediate advice to emergency responders and drivers during HazMat incidents.
What must you do before crossing a state line while transporting hazardous materials?
B. Verify that the HazMat regulations of the state you are entering allow the materials and routing — HazMat routing rules vary by state. Some materials require specific routes or are prohibited on certain roads within specific states. Before crossing state lines with HazMat, verify the destination state allows your specific cargo and chosen route.
If your vehicle is involved in an accident with injuries, you should NOT:
A. Move seriously injured persons unless there is a fire danger — Do not move seriously injured persons unless there is immediate danger such as fire, as movement could worsen injuries.
What is a 'converter dolly' used for?
B. To connect a second semitrailer to a lead trailer, forming a double combination — A converter dolly is a set of one or two axles with a fifth wheel, used to convert a semitrailer into a full trailer. It connects two trailers to make a double (B-train) combination.
Sleeper berth time can be split into two periods as long as:
D. One period is at least 7 hours and the other at least 2 hours, totaling 10 — The sleeper berth split provision allows one period of at least 7 hours and another of at least 2 hours, totaling at least 10 hours.
How do you inspect the converter dolly pintle hook connection during a pre-trip for doubles?
C. Check that the pintle hook latch is closed and locked and the safety latch is engaged — Inspect the pintle hook by checking that the latch is fully closed and locked, the safety latch is engaged, and there are no cracks or damage. A missing or open safety latch is a defect requiring correction before driving.
Baggage and freight should be secured to:
D. Prevent movement that could affect vehicle handling or hurt passengers — Unsecured items can shift, affecting vehicle handling or becoming projectiles that could injure passengers in a sudden stop or crash.
Smoking is prohibited within ___ feet of any vehicle containing explosives or oxidizers:
B. 25 feet — Smoking is prohibited within 25 feet of any vehicle carrying explosives, oxidizers, or flammables.
The Florida 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 Florida, driver licensing is handled by the Florida Department of Highway Safety and Motor Vehicles (FLHSMV), so you'll often see the exam called the FLHSMV CDL general knowledge test. The practice tests on this page match the official FLHSMV 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.