A driver is transporting a mixed load of hazardous materials. The vehicle contains 300 pounds of UN1202, Diesel fuel, Class 3, PG III, and 750 pounds of UN1789, Hydrochloric acid, Class 8, PG II. What placarding is required for this vehicle?
- AA 'DANGEROUS' placard.
- BBoth 'FLAMMABLE' and 'CORROSIVE' placards.
- COnly a 'FLAMMABLE' placard.
- DOnly a 'CORROSIVE' placard.
Show answer & explanationAnswer & explanation
Correct answer: A. A 'DANGEROUS' placard.
Neither UN1202 (Diesel fuel) nor UN1789 (Hydrochloric acid) individually exceed the 1,001-pound placarding threshold for their respective hazard classes (Class 3 and Class 8). However, when a vehicle contains two or more hazardous materials in different hazard classes, and their aggregate gross weight exceeds 1,001 pounds, the vehicle must be placarded with the 'DANGEROUS' placard. The total weight is 300 + 750 = 1,050 pounds, which exceeds 1,001 pounds.
Why the other options are wrong
- B. Specific placards for these classes are not required individually, nor would they be combined without meeting the 1,001 lb threshold for each.
- C. Diesel fuel is below its individual threshold for placarding.
- D. Hydrochloric acid is below its individual threshold for placarding.
Aggregate Placarding Rule (Mixed Classes)
If a vehicle contains two or more hazardous materials of different hazard classes, and their aggregate gross weight exceeds 1,001 pounds, a 'DANGEROUS' placard is required.
- Applies to mixed loads with different hazard classes.
- Individual materials must be below their specific placarding thresholds.
- Total aggregate weight must exceed 1,001 pounds.
Memory trick: Different classes, over a grand, 'DANGEROUS' placard for the land.