Massachusetts Hazmat CDL Practice Test

This is a free 20-question practice test for the Hazmat portion of the Massachusetts Commercial Driver's License knowledge exam. Questions are pulled from a pool of 68 drawn from the AAMVA CDL Manual, which is the source document the Massachusetts Registry of Motor Vehicles uses to write its actual exam.

How it works: Click an answer. The correct choice highlights in green, and you'll see a short explanation. Aim for 85% or better before you sit for the real test in Massachusetts.

Question 1 of 20

When tarping hazmat cargo, you must:

Cover the placards
Leave placards visible at all times
Tarp only at night
Use only red tarps

Correct. Placards must remain visible. Tarps and decorations may not block them.

Question 2 of 20

A driver of a hazmat-loaded vehicle must check the tires:

Once before the trip
At the start of the trip and every time the vehicle is parked
Only at fueling
Never

Correct. Hazmat drivers must check tires at the beginning and again each time the vehicle is parked. A flat or smoking tire must be addressed before continuing.

Question 3 of 20

When a hazmat shipment crosses international borders:

Documentation may need to comply with both US and Canadian/Mexican regulations
No special documentation is needed
Only US regulations apply
Only foreign regulations apply

Correct. Cross-border hazmat may require documentation in compliance with both jurisdictions, plus customs paperwork.

Question 4 of 20

Hazard Class 1 is:

Flammable liquids
Explosives
Corrosives
Radioactive materials

Correct. Class 1 covers explosives, divided into divisions 1.1 through 1.6 by mass-explosion and projection hazard.

Question 5 of 20

A driver is required to carry an ERG (or equivalent) when:

Driving any commercial vehicle
Transporting any quantity of hazardous materials
Only when hauling explosives
Only on weekends

Correct. Whenever hazmat is being transported, the driver must have access to current ERG information for the materials in question.

Question 6 of 20

The 24-hour emergency response phone number on the shipping paper:

Is optional
Must be provided by the shipper and monitored 24 hours per day
Is the driver's personal phone
Is for billing

Correct. The 24-hour emergency contact must be a person knowledgeable about the materials, available 24/7. Many shippers contract CHEMTREC or similar.

Question 7 of 20

Where can a hazmat-placarded vehicle never be parked?

On private property
Within 5 feet of the traveled portion of a roadway, except briefly for vehicle operation
Anywhere
At a truck stop

Correct. Never park within 5 feet of the traveled portion of a road. Avoid populated areas, near open fires, and near places where people congregate.

Question 8 of 20

Class 7 (Radioactive) materials require:

Special placards depending on the radiation level (I, II, or III), maintaining a Transport Index, and limits on aggregate radioactivity in a vehicle
No special handling
Only one placard
No documentation

Correct. Class 7 materials use Roman-numeral category labels (RADIOACTIVE I, II, III), placarded based on aggregate Transport Index, and have specific transport limits.

Question 9 of 20

The H endorsement TSA background check is required to be renewed every:

Year
3 years
5 years
10 years

Correct. The TSA HME is good for five years. Renew before expiration to avoid losing the endorsement.

Question 10 of 20

Subsidiary risk labels on a package indicate:

Additional hazards beyond the primary hazard
Just decoration
The price
The weight

Correct. Some materials have multiple hazards. The primary hazard is shown on the top-class label; subsidiary risks (e.g., toxic AND flammable) are shown on additional labels.

Question 11 of 20

When you stop a hazmat-placarded vehicle at the side of the road, you must place reflective triangles:

Within 10 minutes of stopping
Immediately, but never use flares with Division 1.1, 1.2, 1.3 explosives, oxidizers, or flammable cargo
Only if dark
Only if other vehicles are present

Correct. Place warning devices within 10 minutes. Never use flares with explosives, flammable cargo, or oxidizers — use reflective triangles or red lanterns.

Question 12 of 20

Placards must be at least how many inches on each side?

10.75 inches (273 mm)
5 inches
15 inches
20 inches

Correct. Placards are diamond-shaped, at least 250 mm (about 10.75 inches) on each side.

Question 13 of 20

When parking a placarded hazmat vehicle at a truck stop overnight, you should:

Park in a designated hazmat parking area, follow attendance rules for explosives, never block traffic
Park behind the fuel pumps
Park in the entrance
Park anywhere

Correct. Use designated hazmat parking. Explosives and certain other materials require attended parking; review the carrier's policy and federal rules.

Question 14 of 20

A leaking package of hazmat:

Should be immediately driven to the destination
Must not be transported; secure and report
Should be wrapped in plastic
Should be ignored

Correct. Never transport a leaking package. Secure the area, report to the carrier, contact emergency services if the leak poses immediate danger.

Question 15 of 20

Carrying a hazmat shipment without the required shipping paper:

Is allowed if you remember the cargo
Is a violation; the shipping paper must be present and accessible
Is allowed if you have a phone
Has no consequence

Correct. Operating without proper shipping papers is a regulatory violation and dangerous — emergency responders rely on the paper to identify materials.

Question 16 of 20

Hazardous materials are products that:

Are heavier than normal cargo
Pose a risk to health, safety, or property during transportation
Can only be hauled at night
Require a special trailer color

Correct. Hazardous materials (hazmat) are products that pose a risk to health, safety, or property during transportation. Hazmat regulations are codified in 49 CFR.

Question 17 of 20

A vehicle hauling explosives may not be parked within:

100 feet of an open fire, school, theater, or place where people gather
10 feet of any building
One block of a fire station
Any distance

Correct. Class 1 explosives have specific parking restrictions — at least 300 feet from open fires; never near schools, theaters, or places where people gather.

Question 18 of 20

When refueling a hazmat-loaded vehicle:

Leave the engine running
Turn off the engine, do not smoke, and someone must control the fueling process
Smoke if you are far enough away
It does not matter

Correct. Engine off, no smoking within 25 feet of the vehicle being fueled, and someone must be in control of the fueling at the nozzle.

Question 19 of 20

When you transport Division 1.1 or 1.2 explosives, you must have a written route plan:

No, never
Yes — required for these explosives
Only on weekends
Only across state lines

Correct. A written route plan is required for transporting Division 1.1 or 1.2 explosives. The driver must follow it unless there is an emergency.

Question 20 of 20

A driver may not carry hazmat aboard a vehicle without:

A current Hazmat (H) endorsement on the CDL
A green light
Two cell phones
A reflective vest

Correct. Hauling placardable hazmat requires the H endorsement, which includes a TSA Threat Assessment background check.

About the Massachusetts Hazmat exam

Most states administer 30 Hazmat questions and require 80% to pass. The exam covers hazard classes, the shipping paper, placards and labels, loading and unloading, driving and parking rules, emergency response, and the Emergency Response Guidebook (ERG).

The Massachusetts Registry of Motor Vehicles follows the federal CDL standards established by FMCSA. To earn the Hazmat credential, you must answer at least 80% of the questions correctly. Many candidates score lower the first time because the test pulls from a large pool — refreshing this page will give you a different mix of questions, drawn from the same authoritative source.

Want more practice? Try the full Hazmat question bank or browse all Massachusetts CDL practice tests.