Free Massachusetts DMV CDL — General Knowledge Practice Test 2026
The Massachusetts CDL — General Knowledge knowledge test has 50 questions, and you need 40 correct (80%) to pass. Practice free with questions written from the official Massachusetts driver handbook — every one has a clear explanation, and you can retake as often as you like with no sign-up.
Content reviewed against official driver handbooks · August 12, 2026
What's on the Massachusetts written test
The Massachusetts CDL — General Knowledge knowledge test has 50 questions; you need 40 correct (80%) to pass.
Based on the official Massachusetts exam format — always confirm current details with your state DMV.
Practice by topic
Focus on one area at a time — each topic has its own set of Massachusetts practice questions.
Learn the shapes, colors, and meanings of regulatory, warning, and guide signs — from stop and yield to construction and school-zone signs.
Speed limits, turning and signaling rules, headlight and seat-belt requirements, and the everyday laws every driver must follow.
How to read traffic signals, lane lines, and pavement markings — including yellow and white lines, arrows, and flashing lights.
Who goes first at intersections, four-way stops, roundabouts, and crosswalks, and how to yield to pedestrians and emergency vehicles.
Following distance, scanning, blind spots, using your lights, and the habits that prevent crashes and keep you in control.
Driving safely around motorcycles, bicycles, large trucks, pedestrians, and school buses — and knowing who has the right of way.
Blood alcohol limits, zero-tolerance and implied-consent laws, and how alcohol and drugs — legal or not — affect your driving.
Legal and illegal parking, colored curbs, distances from hydrants and crossings, and how to park safely on hills.
Choosing a safe speed, keeping a space cushion, adjusting for weather and traffic, and understanding stopping distance.
What to do when things go wrong — brake failure, tire blowouts, skids, and stalling on railroad tracks.
The point system, license suspension, provisional-license rules, insurance requirements, and other licensing basics.
How to pass the first time
- Read the official Massachusetts driver handbook at least once before test day.
- Practice by topic to find your weak spots, then fix them.
- Take full-length practice tests until you pass comfortably every time.
- Read every explanation — understanding beats memorizing.
Massachusetts CDL — General Knowledge test — frequently asked questions
How many questions are on the Massachusetts CDL — General Knowledge test?
The Massachusetts CDL — General Knowledge knowledge test has 50 questions, and you need 40 correct (80%) to pass. Our practice tests mirror that format.
How many questions can I miss on the Massachusetts CDL — General Knowledge test?
You can miss up to 10 of the 50 questions and still pass — you need 40 correct, which is 80%.
Can I retake the practice test?
Yes — practice as often as you like, completely free. The questions and answer choices are shuffled each time.
Can I take the Massachusetts practice test in Spanish?
Yes. Every question here is available in English and Spanish — switch languages anytime. Many states also offer the real knowledge test in languages other than English; confirm what Massachusetts offers with your DMV.
Can I practice on my phone?
Yes. The practice tests work in any mobile or desktop browser — no app or sign-up needed — so you can study anywhere.
Are these the real DMV test questions?
No. Our questions are original, written from the current official Massachusetts driver handbook to match the real test's topics and style. We are not affiliated with any DMV or government agency.
What's the best way to study?
Read the Massachusetts driver handbook, practice by topic to target weak areas, and finish with full-length tests until you consistently pass.
Other Massachusetts practice tests
Take the CDL — General Knowledge test in another state
Every Massachusetts question is written from the official Massachusetts driver handbook and checked against its current edition. DMV Test Free is a free, independent study resource — not affiliated with any DMV or government agency. About DMV Test Free
Massachusetts CDL — General Knowledge questions with answers
20 sample questions from the Massachusetts CDL — General Knowledge question bank — each with the correct answer, a short explanation, and the section of the official handbook it comes from.
Show all 20 questions with answers
1. How long is a Massachusetts Commercial Learner's Permit (CLP) valid?
Correct answer: 180 days
A CLP is valid for 180 days and may be renewed once for another 180 days; after that you must apply for a new CLP and retake any required knowledge tests.
Source: Massachusetts CDL Manual — Preface: Massachusetts CDL Information
2. Why should you be especially cautious around children near the roadway?
Correct answer: They may act suddenly without checking for traffic
Children tend to act suddenly without checking for traffic, and children playing together may dart into the road without looking, making them a serious hazard.
Source: Massachusetts CDL Manual — Section 2.8: Seeing Hazards
3. Within how many minutes of stopping on the road or shoulder must you set out your emergency warning devices?
Correct answer: Within 10 minutes
Warning devices must be placed within ten minutes of stopping so that approaching drivers get enough notice of your disabled vehicle.
Source: Massachusetts CDL Manual — Section 2.5: Communicating
4. On a wet road, about how much should you reduce your speed compared with dry pavement?
Correct answer: By about one-third
Wet roads can double stopping distance, so cut your speed by about one-third — for example, slowing from around 55 mph to about 35 mph.
Source: Massachusetts CDL Manual — Section 2.6: Controlling Speed
5. Why should you never let traffic conditions trap you into stopping on railroad tracks?
Correct answer: A train could strike you before you can clear the tracks
Don't let traffic leave you halted over the rails; make certain you can roll completely clear before you start over, because a trapped rig could be struck by a train.
Source: Massachusetts CDL Manual — Section 2.15: Railroad-Highway Crossings
6. If the ABS on your vehicle malfunctions, what braking do you still have?
Correct answer: Your normal (regular) brakes
If the ABS fails you still have your normal brakes, so you drive and brake as you always have, but you should get the system serviced soon.
Source: Massachusetts CDL Manual — Section 2.18: Antilock Braking Systems
7. In very hot weather, how often should you check the tire mounting and air pressure while driving?
Correct answer: Every two hours or 100 miles
Inspect the tires about every two hours or 100 miles in very hot weather; heat raises tire pressure, and a tire too hot to touch should be left to cool.
Source: Massachusetts CDL Manual — Section 2.14: Driving in Very Hot Weather
8. It is illegal to operate a commercial motor vehicle if your blood alcohol concentration (BAC) is at least what level?
Correct answer: .04%
Driving a CMV with a BAC of .04% or higher is illegal and carries a loss of the CDL for at least one year on a first offense.
Source: Massachusetts CDL Manual — Section 1.3: CDL Disqualifications
9. If an oncoming vehicle has wandered into your lane, which direction is usually best to steer to avoid a crash?
Correct answer: To your right
Move to your right when an oncoming vehicle wanders into your lane, since a driver who realizes the mistake will naturally swing back toward their own lane.
Source: Massachusetts CDL Manual — Section 2.17: Driving Emergencies
10. Signs are posted along highway work zones because the leading cause of death and injury there is which of the following?
Correct answer: Vehicles that are traveling too fast
Traffic moving too fast is the number-one source of work-zone deaths and injuries, so drivers must obey the reduced limits posted through the whole zone.
Source: Massachusetts CDL Manual — Section 2.6: Controlling Speed
11. Which group of endorsements may legally appear on a Commercial Learner's Permit (CLP)?
Correct answer: Passenger, school bus, and tank vehicle
Only the passenger (P), school bus (S), and tank (N) endorsements can be placed on a CLP; the others require a full CDL.
Source: Massachusetts CDL Manual — Section 1: Introduction
12. What happens to your CDL if your personal-vehicle driving privilege is suspended for alcohol or drug violations?
Correct answer: You lose the CDL for one year
If your personal-vehicle license is revoked, canceled, or suspended for alcohol, controlled-substance, or felony violations, you lose your CDL for one year.
Source: Massachusetts CDL Manual — Section 1.3: CDL Disqualifications
13. When you are confronted by an aggressive driver, what is the first thing you should try to do?
Correct answer: Get out of their way
Make every effort to get out of the aggressive driver's way; don't challenge them by speeding up or holding your lane, and avoid eye contact.
Source: Massachusetts CDL Manual — Section 2.10: Aggressive Drivers/Road Rage
14. While placing reflective triangles behind your vehicle, how should you hold them for your own safety?
Correct answer: Between yourself and the oncoming traffic
Keep each triangle between yourself and oncoming traffic as you set it out, so approaching drivers can see you as well as the device.
Source: Massachusetts CDL Manual — Section 2.5: Communicating
15. What is "black ice"?
Correct answer: A thin, clear layer that makes the road look wet
Black ice is a thin, clear film through which the pavement shows, so the surface merely looks wet; watch for it any time it is below freezing and the road looks damp.
Source: Massachusetts CDL Manual — Section 2.6: Controlling Speed
16. After you pull onto the shoulder and come to a stop, what should you always switch on?
Correct answer: The four-way emergency flashers
Turn on the four-way emergency flashers whenever you stop at the side of the road; taillights alone have led following drivers to crash into parked vehicles they thought were moving.
Source: Massachusetts CDL Manual — Section 2.5: Communicating
17. In a front-wheel skid, what is the only way to stop the skid?
Correct answer: Let the vehicle slow down until traction returns
In a front-wheel skid the vehicle goes straight no matter how you steer; the only cure is to let it slow down by stopping hard turning or braking until the front tires regain grip.
Source: Massachusetts CDL Manual — Section 2.19: Skid Control and Recovery
18. What is the difference between blocking and bracing when securing cargo?
Correct answer: Blocking fits against cargo to stop sliding; bracing runs from the top of cargo to the floor or walls
Blocking is placed against the front, back, or sides of cargo to stop it from sliding, while bracing runs from the upper part of the cargo down to the floor or walls of the compartment.
Source: Massachusetts CDL Manual — Section 3.3: Securing Cargo
19. Besides the amount and speed of drinking, what else determines a person's blood alcohol concentration?
Correct answer: The person's body weight
BAC depends on how much you drink, how fast you drink it, and your body weight — a smaller person reaches the same BAC on less alcohol.
Source: Massachusetts CDL Manual — Section 2.22: Alcohol, Other Drugs, and Driving
20. Which of these vehicles is always required to stop at a railroad crossing before proceeding?
Correct answer: A vehicle carrying placarded hazardous materials
Passenger-carrying buses and vehicles hauling placarded hazardous materials must stop at grade crossings even when no train is in sight.
Source: Massachusetts CDL Manual — Section 2.15: Railroad-Highway Crossings