CDL Hazardous Materials Endorsement (HME) flashcards

For a small leak from a cylinder valve of a non-flammable, non-poisonous gas, the immediate action is often to attempt to tighten the valve and ensure good ventilation. If the leak persists, further action is needed.

• Identify the type of gas (non-flammable, non-poisonous).
• Attempt to stop the leak at the source (e.g., tighten valve).
• Ensure ventilation.
• If leak persists, follow emergency procedures.

Memory trick: Hissing valve, just give it a twist, then watch the air flow, no need to be missed!

Initial actions for a suspected release of poisonous/toxic vapors, prioritizing driver safety and professional notification.

• Odor indicates potential invisible hazard.
• Personal safety (evacuation) is paramount.
• Always notify emergency services and employer.

Memory trick: Toxic smell? Step back, secure, and call!

Highway Route Controlled Quantity (HRCQ) radioactive materials, such as Type B or C packages with a Transport Index over 10, must be transported exclusively on state-designated routes for radioactive materials.

• HRCQ defined in 49 CFR 173.403.
• Requires use of 'preferred routes' or 'HM-164 routes'.
• Includes Type B/C packages with Transport Index > 10, or certain quantities of fissile material.
• Driver must follow written route plan and avoid non-designated routes.

Memory trick: Some hazmats are VIPs; they get their own special, pre-approved highway lane.

Initial actions for a small, contained fire involving ORM-D (Other Regulated Materials - Domestic), which are consumer commodities with relatively low hazard.

• ORM-D materials have limited hazard.
• Small fires can often be extinguished by the driver if safe.
• Prioritize safety, but don't overreact to minor incidents.

Memory trick: Small ORM-D fire? Grab extinguisher, give it a try!

For hazardous materials listed in Table 2 of 49 CFR 172.504(b), specific placards are required if the gross weight of a single class of material in non-bulk packages is 1,001 pounds or more, OR if the aggregate gross weight of all Table 2 materials is 1,001 pounds or more.

• Applies to non-bulk packages.
• Threshold is 1,001 pounds for a single class or aggregate.
• If aggregate is over 1,001 lbs but no single class is, 'DANGEROUS' placard may apply unless specific placard is required for a class.

Memory trick: Two Tables, Two Rules: Table 1 Always, Table 2 When Over a Ton (ish).

When a vehicle transports 1,001 pounds or more of a single type of Table 2 hazardous material (not in bulk packaging and no Table 1 materials present), it must be placarded with the specific placard for that material on all four sides.

• Applies to Table 2 materials (e.g., Flammable Gas, Flammable Liquid).
• Threshold: 1,001 lbs or more aggregate gross weight.
• If only one Table 2 material meets the threshold, use its specific placard.
• If two or more Table 2 materials meet the threshold, use 'DANGEROUS' placard (unless specific placards are required).

Memory trick: Table 2 materials need a weight check; over a grand, use the right brand name placard.

The specific and severe hazard associated with Class 4.3 materials, which react violently with water to produce flammable or toxic gases and heat.

• Defining characteristic is reaction with water.
• Produces flammable gases (e.g., hydrogen).
• Can also produce toxic gases and significant heat.
• Often leads to fire or explosion.

Memory trick: Wet + Dangerous = Fire and Gas eruption!

The Uniform Hazardous Waste Manifest (EPA Form 8700-22) is a multi-part form required by EPA regulations to accompany all shipments of hazardous waste, ensuring proper tracking and management from generation to disposal.

• Required by EPA under RCRA.
• Tracks waste 'cradle-to-grave'.
• Must be carried by the driver.
• Different copies for generator, transporter, and disposer.

Memory trick: Hazardous Waste? You need a Manifest, it's the paper trail for the dirty trail!

Drivers must immediately report hazardous materials incidents, especially those involving leaks, spills, or releases, to appropriate authorities like the National Response Center (NRC) and local emergency services.

• Report as soon as safely possible.
• NRC is the federal contact for all hazardous materials incidents.
• Prioritize personal safety before reporting.

Memory trick: Safety First, Then Call for Help, Don't Be a Hero, Be a Reporter.

The primary immediate hazard associated with a large, unignited spill of a flammable liquid, focusing on the danger of vapor cloud formation and subsequent ignition.

• Flammable liquids produce ignitable vapors.
• Vapors can be heavier than air and travel.
• Any ignition source can cause a flash fire or explosion.

Memory trick: Gasoline spill, no fire? Watch the vapors, danger's higher!

When a drum of corrosive material leaks due to a puncture, the best immediate containment strategy is to place the compromised drum into a compatible salvage drum (overpack) to prevent further release and facilitate safe handling.

• Corrosives can damage materials and cause chemical burns.
• Salvage drums (overpacks) are designed for containing leaking containers.
• Avoid direct contact and ensure personal safety first.
• Dilution with water is often not recommended due to exothermic reactions or spread.

Memory trick: Punctured drum, acid's drip, grab a salvage drum, make the safe trip!

Hazardous Materials Regulations specify the content and format of shipping papers, but not a numerical limit on how many distinct hazardous materials can be listed on a single document.

• Each hazardous material requires a complete and accurate basic description.
• Emergency response information must be provided for every HazMat.
• Total quantity of each HazMat must be indicated.
• The number of entries is limited only by practical space and clarity.

Memory trick: Many HazMats on one sheet? If clear, it's a treat!

Incompatible hazardous materials must be segregated during transportation to prevent them from coming into contact or reacting dangerously in the event of a leak, spill, or other incident.

• Based on the Segregation Table (49 CFR 177.848).
• Prevents dangerous chemical reactions.
• Driver must understand and apply segregation rules.
• Methods include physical separation, separate compartments, or different vehicles.

Memory trick: Incompatible materials? Keep 'em apart, or watch the reactions start!

Strict regulations govern where and how vehicles carrying Class 1.1, 1.2, and 1.3 explosives can be parked, emphasizing constant attendance on public roads and specific separation distances for unattended parking on private property.

• Must be attended at all times on public streets/highways.
• Attended means driver is awake, alert, and within 100 feet, or within 25 feet with clear line of sight.
• Unattended parking only on private property, at least 300 feet from buildings, roads, bridges, tunnels, etc.

Memory trick: Explosives demand constant watch on public roads, or a wide safety zone on private land.

Drivers transporting Highway Route Controlled Quantity (HRCQ) radioactive materials must adhere to strict operational and routing requirements, including carrying written route plans and instructions and following approved routes.

• HRCQ refers to specific high-level radioactive shipments.
• Requires approved routes and route planning.
• Driver must possess and follow written instructions.
• Enhanced safety and security measures are in place.

Memory trick: HRCQ is high-stakes; a written route plan is your navigation key!

When a hazardous materials incident occurs, the driver's immediate actions prioritize safety, including isolating the area, protecting themselves and others, and assessing the situation before attempting mitigation or external notification.

• Ensure personal safety and the safety of others.
• Isolate the area and keep people away.
• Assess the situation and identify the material if safe to do so.
• Notify appropriate authorities (e.g., NRC, local emergency services) once initial safety measures are in place and the situation is assessed.

Memory trick: Safety first, then assess, then report. Don't touch, just protect and call.

Upon discovering a hazardous material leak, the driver's immediate responsibility is to take all practicable means to stop the leak or prevent the material from spreading, if it can be done safely. If not, the driver must isolate the area and notify authorities.

• Safety first: only attempt if safe.
• Containment/stopping the leak is paramount.
• If unsuccessful or unsafe, notify emergency services.
• Never continue transport with an uncontained leak.

Memory trick: Leak found? First, safe stop; then, contain or call the cops!

The maximum allowable filling pressure for non-liquefied compressed gas cylinders is generally limited to the marked service pressure at 70°F (21°C), unless specific regulations or special permits allow for higher pressures.

• Based on cylinder service pressure.
• Standard temperature for calculation is 70°F (21°C).
• Different rules apply for liquefied compressed gases.
• Driver must ensure cylinders are not overfilled.

Memory trick: Service pressure is the ceiling, 70°F is the standard scene!

The 'DANGEROUS' placard may be used on a transport vehicle or freight container containing two or more categories of hazardous materials that require placarding under Table 2, but no single category constitutes 2,205 pounds or more.

• Applies to mixed Table 2 materials.
• Total weight must exceed 1,001 pounds.
• No single Table 2 material can exceed 2,205 pounds.
• Simplifies placarding for diverse loads.

Memory trick: Mixed Table 2, over 1000, no single heavy hitter? Dangerous it is!

A driver transporting hazardous materials must perform a thorough pre-trip inspection, including specific checks related to the hazardous cargo such as placards, shipping papers, and securement.

• Verify placards are correctly displayed and legible.
• Ensure shipping papers are present and accessible.
• Check that cargo is properly secured and packaging is intact.
• Inspect for leaks or damage to containers/tanks.

Memory trick: Before you roll, hazmat checks make you whole: placards, papers, and no holes!

Flammable liquids (Class 3) and oxidizers (Class 5.1) are highly incompatible and are forbidden from being loaded together in the same transport vehicle due to the significant risk of fire or explosion.

• Class 3 (Flammable Liquids) and Class 5.1 (Oxidizers) are incompatible.
• Must not be loaded together in the same transport vehicle.
• Segregation rules apply regardless of quantity or placarding thresholds.

Memory trick: Some hazmats are like oil and water; they just can't share the same ride.

When facing a large, unignited vapor cloud from a leaking flammable gas, the paramount immediate action for personal safety is to move rapidly to an upwind location and evacuate the area, prioritizing distance and avoiding both ignition sources and inhalation.

• Flammable gas clouds are highly explosive.
• Vapors can be toxic or cause asphyxiation.
• Upwind evacuation minimizes exposure.
• Never approach a large gas cloud without specialized training and PPE.

Memory trick: Gas cloud's growing, explosion's near, run upwind, banish all fear!

For hazardous materials listed in Table 2 of the placarding regulations, placards are generally required on a transport vehicle or bulk packaging when the aggregate gross weight of all hazardous materials on the vehicle is 1,001 pounds or more.

• Applies to specific hazard classes (Table 2 materials).
• Calculated by aggregate gross weight.
• Threshold is 1,001 pounds.

Memory trick: Weigh the goods, if over a thousand, placard you must!

When an engine fire occurs on a HazMat truck, the primary concern is the engine fire itself, which is typically a Class B fire (flammable liquids). The hazardous materials in the cargo are a secondary consideration unless directly involved.

• Engine fires are usually Class B (flammable liquids).
• Use appropriate extinguisher (e.g., CO2, dry chemical).
• Assess cargo involvement if fire spreads.

Memory trick: Engine BLaze, Cargo's safe, Extinguish that Class B flame!

Drivers transporting placarded hazardous materials must adhere to specific parking restrictions, including prohibitions from parking near certain structures or within specified distances of the traveled portion of a highway, to minimize public risk.

• Regulations in 49 CFR 397.7.
• Restrictions apply to placarded vehicles.
• Aim to keep hazardous materials away from population and critical infrastructure.

Memory trick: Park Smart, Park Far, Don't Be Near Any Car (or Building).

If a driver discovers a leak of hazardous materials from a bulk packaging (like a cargo tank) during transport, immediate action is required to ensure safety and regulatory compliance.

• Movement of a vehicle with a leaking bulk HazMat container is prohibited.
• The driver must stop the vehicle safely and notify the carrier.
• The leak must be contained and repaired before resuming transport.
• Emergency services should be called if the leak poses an immediate threat to life, property, or the environment.

Memory trick: Leak found? Stop, report, fix, then roll!

Certain hazardous materials are deemed too dangerous or unstable for commercial transportation by highway and are explicitly listed as 'Forbidden' in the Hazardous Materials Regulations (49 CFR 173.21).

• Materials forbidden due to extreme hazard (e.g., highly unstable explosives).
• Cannot be transported by commercial motor vehicle under any circumstances.
• Specific examples include certain explosives, pyrophoric liquids/solids, and materials that react dangerously with water (unless properly stabilized/packaged).

Memory trick: Forbidden hazmat is a no-go; if it's too wild, it stays off the road.

Highway Route Controlled Quantity (HRCQ) radioactive materials require a specific, pre-planned, and written route plan that has been approved by the shipper, to minimize public exposure and ensure safety during transit.

• Applies to Class 7 (Radioactive) materials designated as HRCQ.
• Route must be pre-planned and written.
• Route must be approved by the shipper.
• Focuses on minimizing risk to the public.

Memory trick: Radioactive Routes: Plan It, Write It, Get It Right, Stay Away From Light (Populated Areas).

The maximum time allowed by federal regulations to submit a written report (DOT Form F 5800.1) after a reportable hazardous materials incident.

• Applies to incidents meeting specific reportable criteria.
• Separate from immediate oral reporting requirements.
• Mandated by 49 CFR 171.16.

Memory trick: Oral report is quick, written report takes a month to tick!

Drivers transporting placarded hazardous materials must not park on or within 5 feet of the traveled portion of a public roadway, except for brief periods required for operations.

• Applies to all placarded HazMat vehicles.
• Minimum distance from the active road.
• Aims to prevent traffic hazards and mitigate incident impact.
• Different rules apply for parking near bridges, tunnels, or occupied buildings.

Memory trick: Five feet from the road, keep your HazMat load!

Certain hazardous materials are incompatible and, due to their dangerous reactions, are forbidden from being loaded or transported together on the same vehicle. This is determined by segregation tables in 49 CFR 177.848.

• Prevents dangerous reactions (e.g., fire, explosion, toxic gas).
• Segregation table in 49 CFR 177.848 specifies forbidden combinations.
• Forbidden materials cannot be on the same transport vehicle.

Memory trick: Keep the bad chemistry separated, or don't mix at all!

For vehicles placarded with hazardous materials, shipping papers must be kept in specific, readily accessible locations: within immediate reach when the driver is in the cab, or on the driver's seat or in a door pouch when the driver is out of the cab.

• Driver in cab: Within immediate reach.
• Driver out of cab: On driver's seat OR in a pouch on the driver's door.
• Purpose: Allows emergency responders quick access to critical information.

Memory trick: Shipping papers are like your wallet; always on you or in easy grab spots.

Minimum personal protective equipment for initial assessment of a corrosive liquid spill, focusing on splash protection.

• Protects eyes, face, and hands from splashes.
• Allows for initial hazard identification from a safe distance.
• Not suitable for direct contact or unknown airborne hazards.

Memory trick: Corrosive splash? Gloves, goggles, shield quickly dash!

When a single hazardous material from Placarding Table 2 is transported in a quantity of 1,001 pounds or more, the transport vehicle must display the specific placard corresponding to that material's hazard class.

• Applies to Table 2 materials.
• Quantity must be 1,001 lbs or more.
• Display the exact placard for the hazard class.
• Distinguishes from the 'DANGEROUS' placard for mixed loads.

Memory trick: Over a thousand of one kind? Give it its own placard, you'll find!

For spills of Division 4.2 Spontaneously Combustible materials, the immediate priority after ensuring personal safety and notification is to prevent contact with air to avert ignition. This is typically achieved by covering the material with an inert substance.

• Division 4.2 materials ignite on contact with air.
• Prevention of air exposure is key to preventing fire.
• Sand, dirt, or other inert materials can be used for covering.
• Water can sometimes worsen the situation for certain spontaneously combustible materials.

Memory trick: Air is fire, cover it quick, or watch that spontaneous flame trick!

The primary purpose of the Hazardous Materials Regulations (HMR) is to ensure the safe transportation of hazardous materials in commerce, protecting people and the environment from potential harm.

• Protect public safety and health.
• Protect the environment.
• Facilitate hazardous materials commerce while ensuring safety.
• Established and enforced by PHMSA (Pipeline and Hazardous Materials Safety Administration).

Memory trick: HMR: Hazmat's Main Rule is to always keep everyone Safe.

Drivers or qualified personnel must attend a cargo tank motor vehicle continuously from the beginning until the completion of loading or unloading operations for flammable liquids, flammable gases, and certain other hazardous materials.

• Applies to Class 2.1 (Flammable Gas) and Class 3 (Flammable Liquid).
• Attendance must be continuous.
• Ensures immediate response to spills, leaks, or other incidents.
• Regulations in 49 CFR 177.834(i).

Memory trick: Don't Leave the Tank Alone! Watch It Fill, Watch It Drain, No Breaks, No Strain!

For spills of Division 6.2 Infectious Substances, the absolute priority is the safety of personnel. This means donning appropriate personal protective equipment (PPE) before any attempt to assess, contain, or clean up the spill.

• Infectious substances pose biological hazards.
• PPE is the first line of defense against exposure.
• Never approach an infectious spill without proper protection.
• Spill kits for infectious materials often include specific disinfectants.

Memory trick: Germs are lurking, so suit up fast, before you touch anything, make your safety last!

Class 8 hazardous materials are corrosive substances that, by chemical action, will cause severe damage when in contact with living tissue or, in the case of leakage, will materially damage or destroy other freight or the transport vehicle.

• Primary hazard: tissue damage and material corrosion.
• Includes acids, bases, and other corrosive chemicals.
• Requires protective measures for handling and transport.

Memory trick: Eight is Great for Dates, but for Corrosives, It's Destructive Traits!

A catastrophic explosion that occurs when a liquid stored above its boiling point under pressure (e.g., LPG) is heated, causing the container to rupture violently.

• Common with pressurized flammable gases (e.g., LPG, propane).
• Caused by external fire heating the tank.
• Results in a large fireball and projectile fragments.

Memory trick: Fire on a pressurized tank? Watch out, it might BLEVE!

If a single hazard class from Table 2 of 49 CFR 172.504(b) is transported in non-bulk packages with a gross weight of 1,001 pounds or more, then the specific placard for that hazard class is required.

• Applies to non-bulk packages.
• Threshold is 1,001 pounds for a single class.
• If threshold met, use the specific placard (e.g., NON-FLAMMABLE GAS).
• Distinguish from 'DANGEROUS' placard use for mixed Table 2 loads.

Memory trick: One Class, One Rule: Over a Ton, Its Own Sign is On.

Immediate actions taken upon discovering a leak of hazardous materials during transportation, prioritizing safety and regulatory compliance.

• Safety is paramount.
• Containment is the first step if safe.
• Emergency services must be notified promptly.

Memory trick: Leaking HazMat? Contain, Secure, Call!

The most reliable methods for quickly identifying hazardous materials and their immediate dangers at an incident scene.

• Placards indicate hazard class.
• Labels provide specific package details.
• Shipping papers contain comprehensive information (UN number, proper shipping name, ERG guide number).

Memory trick: Placards, Labels, Papers: the HazMat info capers!

A Reportable Quantity (RQ) is the amount of a hazardous substance that, if released into the environment, requires immediate reporting to the National Response Center (NRC) and other appropriate government agencies.

• Defined by EPA under CERCLA.
• Indicated by 'RQ' on shipping papers.
• Triggers mandatory incident reporting if released above the threshold.

Memory trick: RQ on paper? Release it, and you'll Report Quite Fast!

For minor, non-immediately dangerous hazardous material leaks that can be safely controlled, the driver's first action, after ensuring safety and stopping, should be to attempt to stop or contain the leak to prevent further release.

• Applies to minor, safely manageable leaks.
• Driver safety is always paramount.
• Goal is to prevent escalation of the incident.

Memory trick: Stop the Drip, Don't Let It Slip, If It's Safe, Do It Quick!

Hazardous materials listed in Placarding Table 1 must be placarded when transported in any quantity (one or more packages) on a transport vehicle or freight container.

• Includes most dangerous hazard classes (e.g., Explosives, Poison Gas, Radioactive).
• No quantity threshold; always placard.
• Specific placard for each material.

Memory trick: Table 1 materials are always 'hot', so placard them on the spot!

Drivers transporting Division 2.3 (Poison Gas) materials must carry and be trained to use a respirator (gas mask or SCBA) appropriate for the specific material, due to the severe inhalation hazard.

• Required for Division 2.3 (Poison Gas).
• Respirator must be suitable for the material.
• Driver must be trained in its proper use.

Memory trick: Some hazmats demand extra gear and specific training, beyond the usual rules.

A strong odor of flammable liquid, even without a visible spill, indicates a vapor release and potential hazard. The immediate response should prioritize isolating the vehicle, eliminating ignition sources, and then safely investigating the source.

• Flammable liquid vapors are often heavier than air and can accumulate.
• Vapors can be ignited by sparks, hot surfaces, or open flames.
• Eliminating ignition sources is critical before investigation.
• Ensure personal safety before attempting to locate the source.

Memory trick: Smell of fuel, danger's near, isolate, kill the spark, then have a peek, my dear!

Regulations dictating the placement and accessibility of shipping papers for hazardous materials transport.

• Must be within arm's reach while driving.
• Must be on the driver's seat or in a clearly visible pouch on the door when out of the vehicle.
• Contains critical information for emergency responders.

Memory trick: Shipping papers: reach for them, or they're on your seat!

Hazardous materials shipping papers must contain specific information to identify the material, its hazards, quantity, and emergency response details, as outlined in 49 CFR 172.202 and 172.203.

• Proper Shipping Name, Hazard Class/Division, UN/NA ID Number, Packing Group.
• Total quantity (weight, volume).
• Emergency response telephone number.
• Shipper's certification (signature).

Memory trick: Shipping papers need a 'WHAT, WHO, HOW MUCH, and CALL' for hazmat.

A multi-part form used to track hazardous waste shipments from the point of generation to their final destination, ensuring proper handling and disposal. It is required by the EPA and serves as the primary shipping document for hazardous waste.

• Required for all hazardous waste shipments.
• Tracks waste 'cradle-to-grave'.
• Contains generator, transporter, and TSD facility information.
• Serves as the shipping paper for hazardous waste.

Memory trick: Paper Trails for Dangerous Cargo: Know Your Docs!

Prioritized actions for emergency responders dealing with a flammable gas leak that has not yet ignited, focusing on preventing ignition.

• Primary danger is explosion/fire if ignited.
• Eliminating ignition sources is paramount.
• Ventilation/dispersion may follow, but only after ignition control.

Memory trick: Gas leaking, no fire? Cut the spark, safe desire!

Recommended extinguishing agents for large fires involving Class 3 Flammable Liquids, prioritizing methods that suppress vapors and cool the fuel.

• Water is generally ineffective and can spread the fire.
• Foam is the preferred agent for large spills/fires.
• Small fires may use dry chemical or CO2.

Memory trick: Flammable liquid fire? Foam it, don't just water it!

Drivers transporting Division 4.3 materials ('Dangerous When Wet' substances) must take all necessary precautions to prevent any contact of the material with water, including rain, snow, or standing water.

• Division 4.3 materials react with water to produce flammable/toxic gases.
• Protect cargo from moisture at all times.
• Avoid parking in open areas during rain or where water could accumulate.
• Ensure packaging is intact and waterproof.

Memory trick: Dangerous When Wet? Keep it dry, keep it safe, or it'll make a gas-y fuss.

If a vehicle transports 1,001 pounds or more of two or more different Table 2 hazardous materials, and no single material requires its specific placard due to exceeding 1,001 pounds, specific rules apply for which placard to use.

• Total aggregate weight of Table 2 materials must be 1,001 lbs or more.
• No single Table 2 material exceeds 1,001 lbs individually.
• If Class 3 (Flammable Liquid) is present, a 'FLAMMABLE' placard is often used for the whole load.
• If no Class 3 material, or if other specific conditions apply, a 'DANGEROUS' placard might be used.

Memory trick: Many small boxes, but total weight means ONE big warning.

Initial isolation distances specified by the ERG for large spills of Division 2.3 Poisonous Gases, emphasizing the need for significant protective zones.

• Highly toxic and can spread rapidly.
• Distances vary by material, quantity, and time of day.
• ERG provides specific guides for each UN number.

Memory trick: Poisonous gas is far and wide, 1/2 mile to the safe side!

Shipping papers for hazardous materials must contain an emergency response telephone number that is monitored 24 hours a day, 7 days a week, and is able to provide immediate emergency response information.

• Mandatory for all hazardous materials.
• Must be monitored 24/7.
• Provides immediate hazard information.

Memory trick: Paper details are key, but emergency phone is the lifeline!

Flammable liquids (Class 3) and corrosive materials (Class 8) are generally considered incompatible and must be segregated during transportation to prevent dangerous reactions.

• Refer to the Hazardous Materials Segregation Table (49 CFR 177.848).
• An 'X' at the intersection of two classes means 'May not be loaded or stored together in the same transport vehicle or magazine.'
• Mixing these classes can lead to fires, explosions, or release of toxic fumes.
• Specific conditions or types of packaging might allow exceptions, but generally they are forbidden together.

Memory trick: Segregation chart: 'X' marks the spot, where not to load, hot or not!

On a hazardous materials shipping paper, the hazard class or division is a mandatory entry and must appear in a specific sequence within the basic description.

• The basic description includes: UN/NA ID, Proper Shipping Name, Hazard Class, Packing Group.
• The hazard class is typically found immediately after the Proper Shipping Name.
• This sequence is critical for quick identification of hazards.

Memory trick: UN-PSN-HC-PG: Universal Names Help People Go!

When transporting multiple hazardous materials, placarding requirements depend on the hazard class, quantity, and packaging type of each material, with specific rules for 'Table 1' vs. 'Table 2' materials.

• Table 1 materials require placarding for ANY quantity.
• Table 2 materials require placarding if 1,001 lbs or more of all Table 2 materials are transported (aggregate gross weight).
• If a vehicle contains any quantity of a Table 1 material, it must be placarded for that material, and placards for Table 2 materials are generally not required unless the Table 2 material is in bulk packaging.

Memory trick: Placards are like a hazmat billboard; Table 1 materials always get a spot, Table 2 materials need to hit the weight limit.