Free Maine CDL practice test online
Take a free Maine CDL practice exam online with clear explanations—no sign-up. Coverage includes general knowledge, vehicle systems, combination vehicles, cargo, and endorsements. Then verify current requirements with Maine Bureau of Motor Vehicles.
CDL knowledge tests are federally regulated, so the passing score in Maine is the same as everywhere else: 80% correct on every knowledge test. You must also hold a commercial learner’s permit for 14 days before the skills test.
New to the knowledge test? CDL endorsements explained · One-week study plan
Requirements before you test
Maine CDL test requirements
Commercial licensing is largely federal. Any figure above credited to a 49 CFR section applies in every state — see 49 CFR 383.135(a)(1) and 49 CFR 383.25(e). A figure credited to Maine Bureau of Motor Vehicles is Maine’s own, and may be stricter than the federal floor. Test length, fees, and scheduling are set by Maine Bureau of Motor Vehicles (official source).
Entry-Level Driver Training comes first
Since February 7, 2022, a new Class A or Class B CDL, a class upgrade, or a first passenger, school bus, or hazardous materials endorsement requires training from a provider on the FMCSA Training Provider Registry (49 CFR 380.600). Practice questions are study material and do not satisfy that requirement.
FMCSA Training Provider RegistryYou need a Maine licence first
A commercial learner’s permit only counts if you already hold an ordinary licence from the same state (49 CFR 383.25(a)(2)). The Maine non-commercial knowledge test runs 30 questions and needs 24 correct, with permits issued from age 15.
Maine permit practice testWhat you will practice
Build coverage topic by topic.
Each question carries a topic, difficulty, explanation, and source section so your review has context.
Sample questions
5 Maine CDL practice questions
Try these Maine sample questions now — each shows the correct answer with a plain-language explanation and a source section. The full 600-question bank is in the practice run.
1. Covering cargo is done mainly to:
- AIncrease axle weight ratings
- BHide the load from competitors
- Protect people from spilled cargo and protect the cargo from weather
- DReduce tire wear
Answer: Protect people from spilled cargo and protect the cargo from weather. Spill protection is often required by state law, and covers also shield freight from weather damage.
Source: Commercial Driver License Manual — Transporting cargo — covering cargo
2. A posted speed for a curve should be treated by a commercial driver as:
- AApplicable only in the rain
- BThe safe speed for any loaded vehicle
- CA minimum to maintain
- A limit set for cars, so slow further
Answer: A limit set for cars, so slow further. Posted curve speeds assume passenger cars. A high, heavy load can roll over at a speed a car handles comfortably.
Source: Commercial Driver License Manual — Driving safely — curves
3. A driver looking down at a phone is a hazard because:
- ADistraction only affects passengers
- BThey have extra attention to spare
- They are not watching the road and may not see you
- DPhones improve reaction time
Answer: They are not watching the road and may not see you. Watch where other drivers are looking, and still stay alert even when they glance toward you.
Source: Commercial Driver License Manual — Seeing hazards — distracted drivers
4. Hazard Class 1 covers:
- AFlammable liquids
- BRadioactive materials
- CCorrosives
- Explosives
Answer: Explosives. Class 1 includes explosives such as dynamite, fireworks, and ammunition (with many divisions and restrictions).
Source: Commercial Driver License Manual — Hazardous materials — hazard classes
5. When you encounter fog, you should:
- AFollow the vehicle ahead as closely as possible
- BAssume it will thin out after you enter
- Be ready to reduce speed; do not assume it will clear
- DUse high beams for better depth
Answer: Be ready to reduce speed; do not assume it will clear. Fog can worsen suddenly. Slow early and increase following distance.
Source: Commercial Driver License Manual — Driving in fog
CDL knowledge areas
Classes and endorsements, organized.
Each area below scopes the reviewed question bank to one knowledge test. The material is federal, so it applies in Maine just like everywhere else — the endorsement guide explains how the codes fit together.
The foundation for commercial driving: inspections, space, speed, communication, hazards, and safe operation.
- Pre-trip inspection
- Space and speed management
- Railroad crossings
- Emergency procedures
Understand air-brake components, inspections, warning devices, stopping distance, and controlled braking.
- Dual air systems
- Low-air warnings
- Brake lag and fade
- Applied-leak and static checks
Prepare for safe coupling, inspection, turning, backing, and handling of tractor-trailer combinations.
- Fifth-wheel inspection
- Coupling and uncoupling
- Off-tracking
- Trailer skid prevention
Study hazard communication, shipping papers, placards, loading rules, parking, and emergency response responsibilities.
- Hazard classes
- Placards and labels
- Shipping papers
- Loading and segregation
Learn how liquid surge, outage, bulkheads, and high centers of gravity change vehicle handling.
- Liquid surge
- Outage requirements
- Smooth braking
- Rollover prevention
Practice converter-dolly inspection, coupling order, rearward amplification, and stability principles.
- Coupling sequence
- Converter dollies
- Rearward amplification
- Space management
Prepare to inspect, load, and operate buses while keeping passengers, aisles, and exits safe.
- Vehicle inspection
- Passenger loading
- Emergency exits
- Prohibited practices
Review student loading, danger zones, mirrors, emergency procedures, and special railroad-crossing duties.
- Danger zones
- Student loading
- Mirror use
- Railroad crossings
More northeast practice
Nearby CDL practice tests
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Common questions
What this practice can—and cannot—tell you.