Wisconsin CDL General Knowledge Practice Test 2025

The Wisconsin CDL General Knowledge test has 50 questions. You need 40 correct (80%) to pass. Wisconsin also offers endorsement tests: HazMat (30 questions), Tanker (30 questions), Passenger (20 questions), School Bus (20 questions), Doubles/Triples (20 questions), and Air Brakes (25 questions). All endorsement tests require 80% to pass.

No. Wisconsin's classification of a first OWI as a civil infraction does not affect federal FMCSA CDL consequences. FMCSA disqualifies CDL holders based on the conduct (0.04%+ BAC in a CMV, refusing testing, or impaired CMV operation) regardless of the state's civil/criminal classification. A Wisconsin CDL holder faces 1-year CDL disqualification for a first CMV OWI offense, just as in any other state.

WisDOT's spring road weight restrictions (late February through April) reduce allowable axle weights on Wisconsin roads during the freeze-thaw season. Affected roads are published annually on WisDOT's website with specific weight reduction percentages (typically 20–40% reductions from legal limits). CDL carriers must check restriction maps before route planning. Operating over spring limits results in significant fines and appears on CDL driver records.

Wisconsin CDL skills tests are administered at WisDOT-approved Third Party Testing sites. Knowledge tests are available at DMV service centers statewide. Wisconsin Third Party Testers include trucking companies, trade schools, and private testing businesses. Use Wisconsin DMV's website to find approved testing locations near you.

Wisconsin CDL holders operating a commercial motor vehicle face the federal 0.04% BAC limit. The state's first OWI civil designation does not change this — FMCSA disqualification applies at 0.04% in a CMV regardless of state classification. Off-duty OWI in a personal vehicle: a first OWI conviction still triggers FMCSA CDL disqualification (1 year) even though the offense is civil in Wisconsin, because the FMCSA system uses conviction data regardless of offense classification.

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 Wisconsin 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 Wisconsin DMV for available language options.

In most states, a CDL is valid for 4–8 years (commonly 4–5 years). To renew your Wisconsin 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 Wisconsin, 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.