A vehicle that needs placards must show them on all four sides, front, back, left, and right, so firefighters and police can recognize the danger whichever way they approach. A single placard at one end could easily be missed.
Packaging for radioactive material cannot stop all radiation, so the label tells handlers how much reaches the outside. The levels rise from White I, the lowest, through Yellow II to Yellow III, which marks the highest surface radiation level allowed.
Once the aggregate gross weight of all Table 2 materials on board, packaging included, reaches 1,001 pounds, the vehicle must be placarded for them. Materials on Placard Table 1, by contrast, require placards in any amount.
DOT rules call for diamond-shaped hazard warning labels, which shippers place on most hazardous materials packages. The distinctive shape helps handlers, drivers, and emergency crews spot the danger quickly.
Placards are diamond-shaped signs on the outside of the vehicle that identify the hazard class of the cargo, so other drivers and emergency responders know what danger is present. They have nothing to do with following distance or with marking a load that extends past the rear.
A material's identification number belongs in its shipping description on the shipping paper and must also be marked on every package, not only on cargo tanks and other bulk containers. Logbooks, fuel receipts, titles, and insurance cards are not places the rules require it.
Placard requirements depend on the class of the material, the quantity in the shipment, and the combined amount of hazardous materials of all classes on the vehicle.
Responders need to know what they are dealing with, so the four-digit ID number is printed on the shipping papers and marked on the package itself. It is meant to be seen, not kept secret.
Hazard warning labels are diamonds, squares turned to stand on one corner, so a dangerous package can be recognized at a glance, and the label's colors and symbol show what kind of hazard it holds.
Hazmat placards are square-on-point signs, usually described as diamonds, shown on the front, back, and both sides of the vehicle. Their colors, symbols, and class numbers tell responders what kind of danger the load presents.
Correct placards must be in place before a hazmat vehicle is driven; the single exception is an emergency, when moving the vehicle is needed to protect life or property. A driver's belief that the cargo is harmless creates no exception.
Federal rules call for at least 3 inches of clear space between a placard and other markings, such as advertising, so nothing reduces its visibility. The placard must also be in good condition and readable from the direction it faces.
A placard tells anyone near the vehicle, including emergency crews, that hazardous cargo is on board and which hazard class it belongs to. It has nothing to do with lane changes or inspection status.
If a package is too small for its label, the shipper is allowed to put the label on a tag that is firmly tied to the package. A QR code is not a substitute for a required label, and listing the material on shipping papers does not replace the label on the package.
Materials that react dangerously with water (Division 4.3) and poison gases (Division 2.3) are on Placard Table 1, so any amount of them requires placards, with no 1,001-pound threshold. Corrosives (Class 8) are on Placard Table 2, so in non-bulk packages they require placards only once the Table 2 materials on board reach 1,001 pounds or more.
Divisions 1.1 and 1.2 are both explosives, so the vehicle needs EXPLOSIVES placards; when divisions are mixed, only the placard for the lowest-numbered division, here 1.1, has to be shown. A DANGEROUS placard cannot be used for these explosives, and BLASTING AGENTS placards go with Division 1.5.
A placard displays the load's hazard class where everyone can see it, letting nearby drivers and emergency crews recognize the danger right away.
Placard decisions depend on the hazard class of each material, the amount being shipped, and the total weight of all hazardous materials on the vehicle. When a material was made has no bearing on whether placards are required.
The 1,001 pounds of flammable material brings the Placard Table 2 total to the 1,001-pound threshold, so each Table 2 class on board must be placarded, the poison included. A poison that is an inhalation hazard would need its placard in any amount anyway, so the small size of the bottle does not remove the poison placard.
Materials listed in Table 1, including Division 1.1 explosives and Division 2.3 poison gases, are so dangerous that any amount at all requires placards. The 1,001-pound cutoff applies only to Table 2 classes.
A placard must be a square no smaller than 9.84 inches (250 mm) on a side, displayed on its point so that it forms a diamond. Meeting only the shape rule or only the size rule is not enough.
A shipment marked 'INHALATION HAZARD' needs a POISON GAS or POISON INHALATION HAZARD placard, whichever applies, together with the placards its hazard class already requires, even for small amounts. A DANGEROUS placard cannot substitute for it, and limiting the weight of the load does not remove the requirement.
A label that cannot fit on the package may go on a tag securely attached to it, so the warning still travels with the package. The label is still required, and the shipping paper cannot stand in for it.
Every question in this set has its own page with the correct answer and an explanation.
