Louisiana CDL Hazmat key terms

Any substance or material that the Secretary of Transportation has determined can pose an unreasonable risk to health, safety, or property when transported in commerce. Under the hazmat rules it includes materials meeting defined hazard classes.

One of nine categories into which regulated materials are grouped by their dominant risk, such as flammable liquid, corrosive, or radioactive. The class drives packaging, labeling, placarding, and handling requirements.

A subdivision within a hazard class that narrows the type or degree of danger, such as Class 2 gases split into flammable, nonflammable, and toxic divisions. Divisions appear in the hazard class column of the hazardous materials table.

The regulatory listing that names each regulated material and shows its hazard class, identification number, packing group, required labels, and special provisions. Drivers and shippers use it to determine how a material must be described and handled.

The required shipping description sequence: identification number, proper shipping name, hazard class or division, and packing group when one is assigned. It must appear in that order on shipping papers and in the correct format.

The name of a hazardous material exactly as listed in the hazardous materials table, used in the shipping description. It identifies the material more precisely than a common or trade name and must not be replaced with a brand name.

A four-digit number, usually preceded by UN or NA, that identifies a hazardous material in the shipping description and on placards and orange panels. It lets responders quickly identify the material from a distance.

A rating of the degree of danger a material presents, shown as I, II, or III, with I being the greatest danger. It affects which packaging is authorized and appears in the basic description when assigned.

The documentation that accompanies a hazardous materials shipment, such as a bill of lading, and carries the basic description, quantity, and emergency response information. It must be readily accessible to the driver during transport.

Written guidance that must accompany hazardous materials shipments, giving first aid, fire, and spill response steps and a 24-hour emergency contact number. It may be on the shipping paper or in a separate guide.

A reference book carried by drivers and responders that lists materials by name and identification number and gives initial isolation, protective action, and first aid guidance. It is organized by guide number for quick use at an incident.

A multi-copy tracking document required when hazardous waste is shipped off site, showing the generator, transporter, and receiving facility. All parties keep copies so the waste can be traced from origin to disposal.

Waste material that is regulated because it is listed as hazardous or exhibits a hazardous characteristic such as ignitability, corrosivity, reactivity, or toxicity. It carries special shipping, manifest, and placarding requirements.

A large diamond-shaped warning sign placed on the outside of a vehicle or bulk package to show the hazard class of its contents. Placards warn responders and the public and must match the material being carried.

The quantity of a hazardous material, generally 1,001 pounds aggregate gross weight for most classes, that triggers placarding of a vehicle. Some materials such as certain divisions require placards at any quantity.

A hazardous material listed in the placarding table that must be placarded only when the 1,001-pound threshold is met. This contrasts with Table 1 materials, which require placards in any quantity.

A high-hazard material listed in the placarding table that requires placards regardless of the amount carried. Examples include certain toxic and explosive materials, so even a small quantity triggers placarding.

The practice of keeping incompatible hazardous materials apart during loading and transport so that a leak, fire, or reaction in one does not endanger the other. It is based on compatibility tables and separation requirements.

Hazardous materials that could react dangerously if they mix, such as an oxidizer and a flammable liquid, or an acid and a cyanide. They must be separated, and their packages must be checked for damage before loading together.

Placing cargo onto or into a vehicle, which for hazardous materials includes checking packages for leaks or damage, securing them against movement, and keeping incompatible materials apart. The loader must verify the shipment matches its papers.

Removing cargo from a vehicle, which for hazardous materials requires checking that the receiving site is ready, watching for leaks or damage, and keeping incompatible materials separated. The unloader must confirm the delivered goods match the shipping paper.

Methods of securing cargo so it cannot shift, slide, or fall during transport, using dunnage, bars, or inflatable bags. For hazardous materials, secure loading protects packages from damage that could cause a release.

The use of tiedowns, straps, and structural supports to hold cargo in place against braking, turning, and road vibration. Proper securement prevents package rupture and spills, which are especially serious with hazardous materials.

A packaging, other than a vessel or barge, that holds a large quantity of material and is loaded directly without inner packaging, such as a portable tank or bulk bag. Bulk packages have their own marking, placarding, and filling rules.

A bulk packaging permanently attached to a motor vehicle, used to carry liquids, gases, or powders in large volume. Cargo tanks must meet design and testing standards and are inspected for leaks, valves, and emergency shutoffs.

A commercial motor vehicle that carries a cargo tank or portable tank with a capacity of 1,000 gallons or more, or multiple tanks totaling that amount. Drivers of tank vehicles must hold the tank vehicle endorsement.

A bulk packaging designed to be loaded and unloaded from a vehicle without being permanently attached, such as an intermodal tank. It must be secured to the vehicle and meet the design and testing rules for its material.

The structural features and driving practices that reduce the chance of a cargo tank overturning, including rollover protection devices, low center of gravity, and slow turns. Tank vehicle rollovers are a leading cause of hazmat releases.

The shifting of liquid inside a partially filled tank during braking, acceleration, or turning, which can push the vehicle and upset its balance. Drivers control surge by braking and accelerating smoothly and slowing before curves.

The empty space left above the liquid in a tank so the contents can expand with temperature changes without overflowing. Filling a tank too full can cause a release through vents or fittings as the liquid warms.

Highway or local rules that limit where hazardous materials may be carried, often requiring designated routes through cities or away from sensitive areas. Drivers must plan routes in advance and follow posted or permitted routing.

Rules that prohibit or limit hazardous materials in certain tunnels because a release or fire inside would be hard to contain. Signs at tunnel entrances state the restrictions, and drivers must use an alternate route when prohibited.

A place where the roadway crosses train tracks, requiring the driver to stop, look, and listen before proceeding. Vehicles carrying hazardous materials must often stop before crossing and may be required to use specific procedures.

Requirements that hazardous materials vehicles be parked away from people, buildings, and other vehicles, on level ground, and attended unless secured. Parking in tunnels, under bridges, or near crowds is generally prohibited.

A parked hazardous materials vehicle that someone stays with or keeps within view so it can be moved quickly in an emergency. When unattended, the vehicle must be secured and parked where a release poses the least risk.

The requirement to notify authorities promptly when a hazardous materials release, fire, or other reportable incident occurs during transport. Reports include the material, location, injuries, and extent of the release.

The amount of a hazardous substance that, if released, triggers reporting to federal, state, and local authorities. Releases at or above this quantity must be reported, and the material may require special shipping papers.

The actions taken at a hazardous materials incident to protect people, property, and the environment, such as isolating the area, calling for help, and keeping upwind. Untrained drivers should not attempt cleanup beyond their training.

The area set up around a hazardous materials release to keep people away, sized using the emergency response guidebook and the material involved. The zone is kept upwind and uphill of the release when possible.

An unintentional release of a hazardous material from its packaging or container. Drivers should stop, secure the area, notify authorities, and avoid contact with the material until trained responders arrive.