When transporting hazardous materials, placards: Before you start the test, please answer the question below regarding your insurance status. Without insurance you will not be able to drive in Ohio Do you currently have car insurance? Yes I have insurance. Great, you're all set! Click here if you still want to compare rates. No, I need insurance. Click here to compare rates from our insurance partner. Question When transporting hazardous materials, placards: Answers Should only be used with explosives. Should be used on all four sides of a vehicle. Should only be used by Class A licensed drivers. Should be used to reduce insurance rates. Explanation Hazardous materials warning placards must be used on all four sides of a vehicle transporting hazardous materials. This questions appears in the following tests: District Of Columbia HazMat Illinois HazMat North Dakota HazMat Tennessee HazMat Utah HazMat West Virginia HazMat West Virginia HazMat West Virginia Tank Wyoming HazMat