Hazmat Basics for Truck Drivers and Carriers

A truck needs placards when it carries hazardous materials above certain amounts, and the driver needs a CDL with an H endorsement. Table 1 materials, such as explosives and poison gas, need placards in any amount. Table 2 materials need them at 1,001 pounds or more (49 CFR 172.504). Carriers must also register with PHMSA, train each hazmat employee every 3 years, and keep shipping papers within the driver's reach.

Facts checked October 16, 2026

Key Points

Hazardous material is a material DOT has found can pose an unreasonable risk when transported. The term includes hazardous substances, hazardous wastes and marine pollutants (49 CFR 171.8)
A vehicle that carries any amount of a Table 1 material needs placards on each side and each end. A Table 2 material needs placards when the load is 1,001 pounds or more in total (49 CFR 172.504)
A driver needs a CDL with an H endorsement for a vehicle that needs placards. An owner-operator who hauls hazmat counts as a hazmat employee and a hazmat employer (49 CFR 171.8)
Hazmat employees must be trained within 90 days of starting or changing jobs, and at least every 3 years after that. The employer keeps a training record (49 CFR 172.704)
A carrier of placarded loads must register with PHMSA each year, which runs from July 1 to June 30 (49 CFR 107.601 and 107.608)
The driver must carry a shipping paper and keep it within reach. It must be first in the pile or tabbed. Keep a copy for 1 year, or 3 years for hazardous waste (49 CFR 177.817)
A vehicle with placarded hazmat must be attended on a public road. Explosives must not be parked near roads, bridges, tunnels or homes (49 CFR 397.5 and 397.7)

When placards are required (49 CFR 172.504)

	When placards are needed	Examples
Table 1 materials	Any amount	Explosives 1.1, 1.2 and 1.3, poison gas (2.3), dangerous when wet (4.3), poison inhalation hazard (6.1), certain organic peroxides, and radioactive Yellow III
Table 2 materials	1,001 pounds or more in total weight, or any amount in a bulk package	Explosives 1.4 to 1.6, flammable and non-flammable gas, flammable and combustible liquids, flammable and spontaneously combustible solids, oxidizers, poisons, corrosives and Class 9
Mixed Table 2 loads	A DANGEROUS placard may replace the separate placards, unless 2,205 pounds or more of one category is loaded at one place	A truck carrying a corrosive and a flammable solid in small packages
Infectious substances (Class 6.2)	No placard	Not covered by the placarding rules

What counts as hazardous material, and who is a hazmat employee?

A hazardous material is a substance that DOT has found can pose an unreasonable risk to health, safety and property when transported. The term includes hazardous substances, hazardous wastes, marine pollutants and elevated temperature materials. It also includes anything in the Hazardous Materials Table in 49 CFR 172.101 (49 CFR 171.8). A hazmat employee is anyone whose work directly affects hazmat safety. That includes the person who loads, unloads, prepares or handles the material and the person who drives the vehicle. It also includes a self-employed owner-operator. An owner-operator who hauls hazmat is both a hazmat employee and a hazmat employer (49 CFR 171.8).

When does a truck need placards?

A truck, trailer or container with any amount of a hazardous material must be placarded on each side and each end. The type depends on the tables in 49 CFR 172.504. Table 1 materials need placards in any amount. Table 2 materials do not need them if the load is under 1,001 pounds of total gross weight, unless the packaging is bulk. A DANGEROUS placard can replace separate placards for mixed Table 2 loads in non-bulk packages. But if 2,205 pounds or more of one category is loaded at one place, that category's own placard is required. Some loads are outside the rule: limited quantities, small quantities, non-bulk combustible liquids and infectious substances (49 CFR 172.500). A Class 1 load with more than one division needs only the placard for the lowest division number.

What training do drivers and owner-operators need?

Each hazmat employee needs four kinds of training. They are general awareness, training for the specific job, safety training and security awareness training. A person who works under a security plan also needs in-depth security training (49 CFR 172.704). A new hazmat employee may start work before training is done, under the direct watch of a trained person. The training must be finished within 90 days. Training must be repeated at least every 3 years. The employer must keep a record for 3 years back, and for 90 days after the person leaves. It must show the name, the last training date, the training materials, who gave the training and a statement that the person was trained and tested. An owner-operator is the employer, so the owner-operator keeps the record.

Do you have to register with PHMSA?

Yes, if you transport a quantity of hazmat that requires placarding. The rule also names loads such as bulk packagings of 3,500 gallons or more, more than 55 pounds of Division 1.1, 1.2 or 1.3 explosives, and highway route controlled radioactive material (49 CFR 107.601). A farmer's work in direct support of farming is exempt. The registration year runs from July 1 to June 30. You may not transport hazmat without a current certificate of registration (49 CFR 107.608). PHMSA's page, updated September 8, 2026, lists 2026-2027 fees of $275 for a small business or non-profit and $2,600 for others, including a $25 processing fee. From the 2026-2027 year, PHMSA no longer accepts paper forms or checks. All of it is done online. Fees can change, so check PHMSA's registration page.

What papers do you carry, and where?

You may not take hazmat for transport unless you have a shipping paper that follows Part 172, or the load is excepted (49 CFR 177.817). The description lists the identification number, the proper shipping name, the hazard class, the packing group and the total quantity (49 CFR 172.202). The shipping paper must be easy to see and reach. If it is mixed in with other papers, it must be tabbed or placed first. While you drive, keep it within reach with your seat belt on, in plain sight or in the holder on the driver's door. When you leave the seat, keep it in the door holder or on the driver's seat. You must also have emergency response information, with a phone number, available at all times while the hazmat is on board (49 CFR 172.600). Keep a copy of the shipping paper for 1 year, or 3 years for hazardous waste.

What are the rules for attending and parking a hazmat truck?

A vehicle with explosives of Divisions 1.1, 1.2 or 1.3 must be attended at all times by the driver or a qualified representative of the carrier. A vehicle with any other hazmat, on a public street, highway or shoulder, must be attended by its driver (49 CFR 397.5). Attended means the person in charge is on the vehicle, awake and not in the sleeper berth, or within 100 feet with the vehicle in view. A vehicle with explosives must not be parked within 5 feet of the traveled road. It must not be parked on private property without the owner's knowledge and consent. It must not be parked within 300 feet of a bridge, tunnel or home. The same goes for a place where people work or gather. A brief stop is allowed when there is no other place to park. A vehicle with other hazmat must not be parked on or within 5 feet of the traveled road, except briefly when necessary (49 CFR 397.7).

Which loads need a security plan or a safety permit?

A person who transports certain materials must have a written security plan. They include any amount of Division 1.1, 1.2 or 1.3 explosives and any amount of a material poisonous by inhalation. They also include large bulk quantities of other listed materials. A large bulk quantity is more than 6,614 pounds of a solid, or more than 792 gallons of a liquid or gas, in one package (49 CFR 172.800). Employees who handle those loads need training on the plan. Some small farmers are exempt. The highest-risk loads also need an FMCSA hazardous materials safety permit. One example is more than 55 pounds of Division 1.1, 1.2 or 1.3 explosives. Others are highway route controlled radioactive material and certain poison inhalation loads. Bulk shipments of methane or natural gas of 3,500 gallons or more also need one (49 CFR 385.403).

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Frequently Asked Questions

Do I need placards for a small amount of hazmat?+

It depends on the material. A Table 1 material, such as explosives 1.1 to 1.3 or poison gas, needs placards in any amount. A Table 2 material does not need them if the load is under 1,001 pounds of total weight, unless it is in a bulk package (49 CFR 172.504).

Do I need an H endorsement to haul placarded loads?+

Yes. A driver needs a hazmat endorsement to drive a vehicle that carries hazmat in a quantity that needs placards. The endorsement requires a knowledge test and a TSA security check (49 CFR 383.93 and 383.71).

Does an owner-operator need hazmat training?+

Yes. A self-employed owner-operator who hauls hazmat is both a hazmat employee and a hazmat employer, so you must be trained within 90 days and at least every 3 years, and keep your own training record (49 CFR 171.8 and 172.704).

How much does PHMSA hazmat registration cost?+

PHMSA lists $275 for a small business or non-profit and $2,600 for others for the 2026-2027 year, including a $25 processing fee. Check PHMSA's registration page for the current fee before you file, because fees can change.

Where do I keep the hazmat shipping paper?+

Within your reach while you drive and buckled in, in plain sight or in the holder on the driver's door. When you leave the seat, put it in the door holder or on the driver's seat. It must be tabbed or on top if it is mixed with other papers (49 CFR 177.817).

Can I leave a hazmat truck unattended at a truck stop?+

Explosives 1.1, 1.2 and 1.3 must be attended at all times. Other placarded hazmat on a public street, highway or shoulder must be attended by the driver. Parking rules apply too, such as not parking within 5 feet of the traveled road (49 CFR 397.5 and 397.7).

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This is a plain-language summary for reference, not legal advice. Check the official rule text before you rely on any detail. Ask a compliance professional about your own operation.