A driver is transporting a mixed load of hazardous materials. The vehicle contains 300 pounds of UN1203, Gasoline, Class 3, PG II, and 200 pounds of UN1830, Sulfuric acid, Class 8, PG II. The vehicle also contains 600 pounds of UN1075, Liquefied Petroleum Gas, Class 2.1, in non-bulk cylinders. What placarding is required for this vehicle?
- AFLAMMABLE GAS, FLAMMABLE, and CORROSIVE placards
- BFLAMMABLE GAS and FLAMMABLE placards
- CCORROSIVE placard only
- DFLAMMABLE placard only
Show answer & explanationAnswer & explanation
Correct answer: B. FLAMMABLE GAS and FLAMMABLE placards
UN1075 (LPG) is a Class 2.1 (Flammable Gas) and a Table 1 material, requiring a FLAMMABLE GAS placard for any quantity. UN1203 (Gasoline) is a Class 3 (Flammable Liquid). The total weight of Class 3 materials is 300 pounds, which is below the 1,001-pound threshold for Table 2. However, if a FLAMMABLE GAS placard is required, a FLAMMABLE placard is also required for any amount of Class 3 material. UN1830 (Sulfuric acid) is Class 8. The 200 pounds of Class 8 is below the 1,001-pound Table 2 threshold, and since a FLAMMABLE GAS placard is on the vehicle, a CORROSIVE placard is not required as per the aggregate placarding rules (unless the Class 8 material itself meets a Table 1 threshold, which it does not). Therefore, only FLAMMABLE GAS and FLAMMABLE placards are needed.
Why the other options are wrong
- A. The CORROSIVE placard for 200 lbs of Class 8 is not required when a FLAMMABLE GAS placard is already displayed, as per 49 CFR 172.504(f)(7) exceptions for Table 2 materials.
- C. Insufficient; Flammable Gas and Flammable Liquid hazards are present and require placarding.
- D. Insufficient; LPG requires FLAMMABLE GAS placard.
Mixed Load Placarding Exception (49 CFR 172.504(f)(7))
When a vehicle is placarded with a FLAMMABLE, FLAMMABLE GAS, POISON GAS, or DANGEROUS WHEN WET placard, other Class 3, 8, or 9 materials that would normally require placarding under Table 2 (1,001 lb threshold) do not require their specific placards if they are below their Table 1 threshold.
- Applies to specific combinations of placards.
- Allows for fewer placards in certain mixed loads.
- Does not exempt Table 1 materials or bulk quantities.
Memory trick: When 'Many Hazards' mix, check 'Exceptions' for the fix!