General Knowledge · Hazardous Materials Rule for All Commercial Drivers
Where must placards be displayed on a vehicle or container carrying a quantity of hazardous material that requires placarding?
1.On each side and each end, so the hazard is visible from every directionCorrect answer
2.A single placard on the rear of the vehicle satisfies the whole requirement
3.Placards are only required while parked at a terminal, not while the vehicle is moving
4.Placarding is optional if the shipping papers already list the hazard class
Explanation
A vehicle, bulk packaging, or freight container holding a quantity of hazardous material requiring placards must display the correct placard on each side and each end, under 49 CFR 172.504, so the hazard is visible from every direction of approach. The wrong options each understate the requirement: a single rear placard does not satisfy a rule requiring all four sides, the placarding requirement applies whether the vehicle is parked or moving, and the physical placard requirement stands independent of what the shipping papers already state.
Source: 49 CFR 172.504
Related Hazardous Materials Rule for All Commercial Drivers questions
- What must a driver hold to operate a commercial motor vehicle used to transport hazardous materials as defined by federal regulation?
- For CDL purposes, what makes a material a "hazardous material" requiring an endorsement to transport?
- How does federal regulation organize hazardous materials for shipping and placarding purposes?
- What does federal regulation require before a driver may receive a hazardous materials endorsement and transport hazardous cargoes?