Michigan CDL Practice Test 2026 & Michigan SOS Rules
Prepare for your commercial driver's license with the official Michigan exam curriculum. TruckerPass combines the 985 federal FMCSA questions with Michigan-specific commercial vehicle limits, air brake testing, and the 2026 Modernized Pre-Trip inspection.
Michigan 11-Axle Heavies & Seasonal Frost Laws
- Michigan allows unique high-gross-weight commercial vehicles (up to 164,000 lbs on 11 axles) under state bridge formula rules.
- Spring seasonal weight restrictions (Frost Laws) reduce legal axle weights by up to 35% and speed limits to 35 MPH on unpaved roads.
- Mackinac Bridge crossing (I-75) between the peninsulas enforces high-wind escorts and mandatory vehicle staging during gales.
- Michigan SOS requires 80% on the 50-question CDL General Knowledge test.
Official Michigan Test Format
- Licensing Agency: Michigan Secretary of State (SOS)
- General Knowledge: 50 questions, 80% to pass (at least 40 correct).
- Air Brakes Endorsement: 25 questions, 80% to pass (required for air-equipped rigs).
- Combination Vehicles: 20 questions, 80% to pass (Class A tractor-trailers).
- Modernized Pre-Trip Inspection: 4-Zone component walkaround + 4-Step air brake test.
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