Wisconsin CDL Study Guide
Wisconsin issues commercial driver licenses (CDLs) through the Wisconsin Department of Transportation Division of Motor Vehicles (DMV). The process begins with a Commercial Learner's Permit, includes federal Entry-Level Driver Training, and ends with a three-part skills test. Knowledge tests in Wisconsin are free and walk-in.
Key Wisconsin numbers
- Minimum age (intrastate): 18
- Minimum age (interstate or hazmat): 21
- CLP hold before skills test: at least 14 days
- General Knowledge passing score: 80%
- General Knowledge test: ~50 questions
- Air Brakes test: ~25 questions (required if your vehicle has air brakes)
- Combination Vehicles test: ~20 questions (required for Class A)
Topics on the Wisconsin General Knowledge test
- Vehicle inspection (pre-trip, en-route, post-trip)
- Driving safely (speed management, space management, hazard perception)
- Transporting cargo safely
- Air brakes (if your vehicle is air-braked)
- Combination vehicles (Class A)
If you fail a test
If you fail a Wisconsin CDL knowledge or skills test, you can schedule a retake. The DMV's CDL pages list current wait periods. Skills test retake fees may apply since each attempt is charged.
Frequently asked questions
How old do I have to be to get a Wisconsin CDL?
You must be at least 18 to get a Wisconsin CDL for driving inside Wisconsin. You must be 21 to drive across state lines or carry hazardous materials.
How long do I have to hold the Wisconsin CLP?
You must hold your Commercial Learneru0027s Permit for at least 14 days before taking the skills test. The CLP is valid for 180 days.
Are Wisconsin CDL knowledge tests free?
Yes. Wisconsin DMV does not charge for CDL knowledge tests. They take about 1.5 hours and no appointment is needed.
How much does the Wisconsin CDL skills test cost?
The full skills test (Vehicle Inspection, Basic Control Skills, and Road Test) is $150 when taken together.
Do I need ELDT in Wisconsin?
Yes. First-time Class A or B CDL applicants, and people adding H, P, or S endorsements for the first time, must complete federal Entry-Level Driver Training.
How much does a Wisconsin CDL cost?
The CLP costs $30 and the original CDL costs $74. The HazMat endorsement is $44 and the school bus endorsement is $10 when added for the first time.
Free practice
Start a Wisconsin General Knowledge quiz →
Sources: Wisconsin Commercial Driveru0027s Manual (BDS 356 PDF) Wisconsin DMV CDL Manual landing Wisconsin DMV CDL Requirements Wisconsin DMV Skill Test Guide