Louisiana CDL General Knowledge Practice Test 2025

The Louisiana CDL General Knowledge test has 50 questions requiring 40 correct (80%) to pass. Louisiana endorsement tests: HazMat (30 questions), Tanker (30 questions), Passenger (20 questions), School Bus (20 questions), Doubles/Triples (20 questions), Air Brakes (25 questions). All require 80%. Contact Louisiana OMV for current testing fees.

Louisiana CDL holders operating a CMV face the federal 0.04% BAC DWI limit. Louisiana calls the offense DWI (not DUI) but the CDL consequences are identical to federal FMCSA requirements. A DWI conviction in any vehicle triggers CDL disqualification: 1 year for first offense, lifetime for second. OMV reports all DWI convictions to FMCSA within 10 days.

Louisiana CDL hurricane season (June–November) considerations: (1) monitor National Hurricane Center and Louisiana Governor's Office for evacuation orders; (2) know contraflow activation timing and entry points before hurricane season begins; (3) ensure adequate fuel before any evacuation — contraflow has no standard fuel access; (4) know bridge weight and clearance limits on your regular routes in case contraflow uses alternate crossings; (5) carriers serving essential supplies during evacuation may be designated as emergency carriers — contact Louisiana DOTD for emergency vehicle exemptions during declared disasters.

Louisiana CDL skills tests are administered at OMV-approved Third Party Testing sites. Knowledge tests are available at OMV field offices statewide. Louisiana has CDL testing in New Orleans, Baton Rouge, Shreveport, Lafayette, Lake Charles, and other cities. Contact OMV for current Third Party Tester locations and scheduling.

New Orleans CDL routing considerations: (1) Lake Pontchartrain Causeway — check posted height limits; (2) Mississippi River bridge (I-10) — check posted weight limits for your load; (3) Crescent City Connection (CCC, US 90) — toll collection, check weight limits; (4) elevated causeway crosswind exposure; (5) streetcar track crossings on surface streets (cross at 45° angle); (6) narrow French Quarter/warehouse district streets with tight turn radius requirements; (7) post-rain flooding on lower-elevation streets requiring route detours.

A Class A CDL allows you to operate any combination of vehicles with a Gross Vehicle Weight Rating (GVWR) of 26,001 lbs or more, provided the towed unit exceeds 10,000 lbs — this includes tractor-trailers and double/triple trailer rigs. A Class B CDL covers single vehicles with a GVWR of 26,001 lbs or more, or any such vehicle towing a unit not exceeding 10,000 lbs — this includes straight trucks and large buses. A Class C CDL is required for vehicles designed to carry 16 or more passengers (including the driver) or for vehicles transporting hazardous materials that require placarding, when those vehicles do not qualify for Class A or B.

CDL fees vary by state and by the class and endorsements you obtain. Most states charge separate fees for the CDL knowledge test ($10–$30 per attempt), the CDL skills test ($50–$150), and the CDL license itself ($50–$100). Additional fees apply for each endorsement (HazMat, Tanker, Passenger, etc.). The HazMat endorsement also requires a TSA security threat assessment fee of approximately $86. Check your Louisiana DMV website for current fee schedules.

Federal regulations (49 CFR 383.133) require that CDL applicants be able to read and speak the English language sufficiently to understand highway traffic signs and signals and to respond to official inquiries. Many states offer CDL knowledge tests in Spanish and other languages for non-commercial knowledge questions, but the actual CDL test must be taken in a language that allows the driver to meet the English proficiency requirement. Check with the Louisiana DMV for available language options.

In most states, a CDL is valid for 4–8 years (commonly 4–5 years). To renew your Louisiana CDL, you typically need to visit a DMV office, pass a vision test, pay the renewal fee, and update your medical certification (DOT physical). If you hold a HazMat endorsement, your TSA background check must also be current. CDLs cannot generally be renewed online due to federal requirements for in-person verification of medical certification.

If you fail the CDL General Knowledge test in Louisiana, you are typically required to wait a specified period (commonly 1–7 days) before retaking it. Most states allow 2–3 attempts before requiring additional waiting periods or study requirements. There is usually a retest fee for each attempt. Focus on the areas you missed — most states provide a score sheet showing which topic areas you need to review.