Free CDL HazMat Endorsement Exam Flashcards

The federal rules in 49 CFR, issued by the DOT, that govern commercial transport of hazardous materials by all modes. They define classes, packaging, marking, placarding, and shipping-paper requirements. The HazMat test is built almost entirely on the HMR.

The DOT (through PHMSA and FMCSA) regulates the transportation of hazardous materials on the road. The EPA regulates the disposal and handling of hazardous waste. Both touch HazMat, but the driver follows DOT transport rules.

The shipper classifies, packages, marks, labels, and prepares shipping papers, then certifies the shipment. The carrier transports it safely and placards the vehicle. The driver inspects the load, refuses unsafe packages, and handles the material en route.

The master list in 49 CFR 172.101. For each proper shipping name it gives the hazard class, identification number, packing group, label codes, special provisions, and packaging requirements. Shippers use it to classify and describe materials.

Federal ELDT took effect February 7, 2022. Covered drivers obtaining H for the first time must complete theory with an FMCSA Training Provider Registry provider before the state knowledge test; check FMCSA applicability guidance for prior credentials.

Materials that can explode, such as dynamite, ammunition, and fireworks. Class 1 has six divisions (1.1 most hazardous through 1.6 least sensitive). Division 1.1 explosives have a mass-explosion hazard.

Compressed, liquefied, or dissolved gases. Three divisions: 2.1 flammable gas (propane), 2.2 non-flammable/non-toxic gas (oxygen, helium), and 2.3 toxic/poison gas (chlorine). Class 2.3 placards are required for any quantity.

Liquids that give off ignitable vapors. A flammable liquid has a flash point at or below 140 degrees F (gasoline, diesel). A combustible liquid has a flash point above 140 degrees F and below 200 degrees F.

Three divisions: 4.1 flammable solid, 4.2 spontaneously combustible, and 4.3 dangerous when wet. Division 4.3 materials release flammable gas when they contact water, so they must be kept dry.

Division 5.1 oxidizers supply oxygen and intensify fires. Division 5.2 organic peroxides are thermally unstable and can self-decompose, catch fire, or explode if exposed to heat, friction, or contamination.

Division 6.1 covers toxic/poisonous materials; Division 6.2 covers infectious substances. Class 6 materials must never be loaded in the same vehicle as food intended for humans or animals.

Class 7 is radioactive material. Class 8 is corrosives, which destroy skin or corrode metal (battery acid, sodium hydroxide). Class 9 is miscellaneous dangerous goods that pose a hazard not covered by other classes (lithium batteries, dry ice).

A material, often a toxic gas like chlorine or anhydrous ammonia, that is dangerous to breathe even in small amounts. PIH/TIH materials must be placarded regardless of quantity because the hazard is extreme.

The degree of danger a material presents within its class. PG I is great danger, PG II is medium danger, PG III is minor danger. The packing group affects packaging strength and handling requirements.

A four-digit code that identifies the material (UN1203 is gasoline). 'UN' is internationally recognized; 'NA' applies in North America only. Responders use it to look the material up in the Emergency Response Guidebook.

Diamond-shaped signs that warn the public and emergency responders of the hazard class inside the vehicle using color, symbol, and class number. Placards do not name the company or destination - they communicate danger.

Placards must be displayed on all four sides of the vehicle - front, rear, and both sides - so the hazard is visible from any direction of approach. They must be readable, secured, and away from other markings.

For Table 2 materials, placards are required once the total weight of all hazardous materials on the vehicle reaches 1,001 pounds aggregate gross weight. Below that, non-bulk Table 2 loads generally do not need placards.

Table 1 materials (such as Division 1.1, 1.2, 1.3 explosives, 2.3 poison gas, and PIH materials) must be placarded for ANY quantity. Table 2 materials only need placards once the load reaches 1,001 pounds aggregate.

Used for a mixed load of two or more Table 2 hazard categories totaling 1,001 pounds or more, when no single class needs its own placard. If 2,205 pounds or more of one category is loaded at one stop, that class's specific placard is used instead.

Bulk packages such as cargo tanks must be placarded for any quantity of a Table 2 material - the 1,001-pound rule applies only to non-bulk packages. A cargo tank of gasoline gets Flammable placards on all four sides regardless of weight.

Markings are descriptive text on the package: proper shipping name, UN/NA number, and consignee or shipper address. Labels are diamond-shaped symbols showing the hazard class. Markings tell what it is; labels show the hazard.

For liquids, bulk packaging has a maximum capacity greater than 119 gallons; non-bulk is 119 gallons or less. The distinction drives placarding, marking, and which inspection rules apply.

Two upward-pointing arrows marked on combination packaging containing liquid mean the package must be kept upright. Loading it on its side risks leaks from closures and bungs.

Indicates a small amount of hazardous material in sturdy combination packaging. Because the reduced quantity lowers the risk, Limited Quantity shipments are exempt from some requirements such as placarding and full shipping papers.

Hazmat shipping papers must list the basic description in order: identification number, proper shipping name, hazard class or division, and packing group - for example 'UN1203, Gasoline, 3, PG II'.

When a shipping paper lists hazardous and non-hazardous items together, the hazmat entries must stand out: listed first, printed in a contrasting color, highlighted, or marked with an 'X' in the HM column.

While driving, papers must be within the driver's immediate reach, readily recognizable, and either in a pouch on the driver's door or on the seat. They cannot be locked in the glove box or buried with the cargo.

If the driver steps away, the papers must be left in the driver's door pouch or on the driver's seat - placed so emergency responders can find them quickly from outside the cab.

A signed statement on the shipping paper in which the shipper certifies the material is properly classified, described, packaged, marked, labeled, and in proper condition for transport. The shipper - not the driver - signs it.

The amount of a hazardous substance that, if released, must be reported to the National Response Center. 'RQ' next to an entry on shipping papers flags the material as one with federal spill-reporting requirements.

Carriers must keep a copy of each hazmat shipping paper for one year after the initial carrier accepts the shipment. Hazardous waste manifests must be retained for at least three years.

A reference responders use to quickly identify a material's hazards by UN number or name and find initial protective actions. The blue section is the name index, yellow the ID-number index, orange the action guides, and green the isolation distances.

Personal and public safety always comes first. Stop in a safe place, identify the material from shipping papers and the ERG, secure the scene, keep bystanders away, then notify emergency services - assess before you act.

A portable extinguisher cannot control a hazmat fire. Warn others, move to a safe distance, and call emergency services. Do not drive a burning vehicle or try to unhitch a burning trailer.

The NRC must be notified for incidents involving a death, a hospitalized injury, major transportation disruption, fire/breakage/spillage of radioactive or infectious material, or release of a Reportable Quantity of a hazardous substance.

Pull over to a safe place, identify the material using shipping papers and the ERG, and stop the leak only if it can be done safely (such as tightening a valve). If not, secure the area and call for help - never wash an unknown chemical with water.

Do not spray a burning tire with a small extinguisher - it may explode. Stop in a safe, open area, evacuate, warn others, and call emergency services. Tire heat can ignite the cargo.

Hand responders the shipping papers - the single most useful document. They use the proper shipping name, hazard class, and UN number to identify the material and choose the correct response.

The core loading rule is to prevent movement. Hazmat packages must be blocked and braced so they cannot shift, tip, or fall during starts, stops, and turns. Drums are loaded upright and braced tight.

A driver must not accept a hazmat package that is leaking or damaged. Providing cargo in proper condition is the shipper's responsibility - the driver should refuse the shipment, not attempt a repair.

Certain hazard classes cannot be loaded, transported, or stored together because they can react dangerously if they mix. The Segregation and Separation Table in the HMR specifies which combinations are prohibited.

Cyanides (Division 6.1) loaded with acids (Class 8) can react to produce deadly hydrogen cyanide gas. This is a strict segregation rule - the two must never travel together.

Never smoke within 25 feet of a vehicle carrying explosives (Class 1), flammables (Class 3), or oxidizers (Class 5). Use only non-sparking tools around explosives, and never run a cargo heater with Class 1, Class 3, or flammable gas loads.

Before loading, inspect the cargo space for holes, cracks, or damage. On a pre-trip, focus on tires, brakes, and any signs of leaks. Tankers require tank-and-fitting checks before loading and after unloading.

A placarded hazmat vehicle must stop 15 to 50 feet before the nearest rail and check for trains. Stops are not required when a police officer or flagman directs traffic, a green traffic signal controls the crossing, or it is marked exempt or abandoned.

Hazmat drivers must use designated hazmat routes where they exist, even if longer, and obey local bans on tunnels and bridges. Routes for explosives are chosen to avoid populated areas and critical infrastructure.

A placarded vehicle must be attended unless parked at a carrier facility, the consignee's site, or a safe haven. Keep it at least 5 feet from the traveled roadway, and not within 300 feet of an open fire, a bridge, or a tunnel.

A government-approved, supervised area where a driver may leave a vehicle carrying explosives unattended. It is one of the few situations where a placarded explosives load does not require the driver's constant attendance.

Every driver seeking a HazMat endorsement must pass a TSA background check screening criminal, immigration, and terrorism databases. Carriers transporting placarded amounts of certain materials must also keep a written security plan covering personnel vetting, access control, and en-route security.