CDL Hazardous Materials Endorsement (HME)Hazardous Materials RegulationsMedium
A driver is transporting a shipment of UN1950, Aerosols, Class 2.1 (Flammable Gas), in non-bulk packages. The total gross weight of the hazardous material is 1,200 pounds. Which of the following statements about placarding is true?
- AThe vehicle must be placarded with a 'FLAMMABLE GAS' placard.
- BNo placards are required because it is a non-bulk shipment.
- COnly 'LIMITED QUANTITY' markings are required.
- DThe vehicle must be placarded with a 'DANGEROUS' placard.
Show answer & explanationAnswer & explanation
Correct answer: A. The vehicle must be placarded with a 'FLAMMABLE GAS' placard.
UN1950, Aerosols, Class 2.1, is a Table 2 material. For Table 2 materials, if the aggregate gross weight of all hazardous materials in that table is 1,001 pounds or more, the vehicle must be placarded with the specific placard for each hazard class. Since 1,200 pounds exceeds the 1,001-pound threshold, a 'FLAMMABLE GAS' placard is required.
Why the other options are wrong
- B. Incorrect. While it's a non-bulk shipment, the weight exceeds the 1,001-pound threshold for Table 2 materials.
- C. Incorrect. 'LIMITED QUANTITY' exemptions typically apply to much smaller quantities and would not apply to 1,200 pounds of this material.
- D. Incorrect. A 'DANGEROUS' placard can be used for mixed loads of Table 2 materials, but when a single Table 2 material exceeds 1,001 pounds, its specific placard is required.
Placarding Table 2 Materials (1,001 lbs Threshold)
Vehicles transporting hazardous materials listed in Table 2 must be placarded with the appropriate specific placards if the aggregate gross weight of all Table 2 hazardous materials on board is 1,001 pounds or more.
- Applies to hazardous materials in Table 2.
- Threshold is 1,001 pounds aggregate gross weight.
- Requires specific placards for each hazard class if threshold met.
Memory trick: Table 1, always; Table 2, check the thousand pounds.