For a 'Dangerous When Wet' material, you must display the specific placard:

In addition to any other placards needed by the product's hazard class. Section 9.3.11: Materials with a secondary hazard of dangerous when

For a 'Dangerous When Wet' material, you must display the specific placard:

ANSWER BREAKDOWN
  • A. Incorrect. "Only if over 1,001 lbs" is not correct. Materials with a secondary hazard of dangerous when wet must display the DANGEROUS WHEN WET placard in addition to any other placards.
  • B. Incorrect. "Only if it is raining" is not correct. Materials with a secondary hazard of dangerous when wet must display the DANGEROUS WHEN WET placard in addition to any other placards.
  • C. Correct. Materials with a secondary hazard of dangerous when wet must display the DANGEROUS WHEN WET placard in addition to any other placards.
  • D. Incorrect. "Instead of the primary hazard placard" is not correct. Materials with a secondary hazard of dangerous when wet must display the DANGEROUS WHEN WET placard in addition to any other placards.