A hazardous materials placard may be no smaller than: Do you currently have car insurance? Insurance is mandatory to drive in Ohio Yes I have insurance. But please show me your best quotes. No, please help me find the best insurance. Question A hazardous materials placard may be no smaller than: Answers Four square inches. Seven square inches. 10 ¾ square inches. Explanation Hazardous materials placards must be at least 10 ¾ square inches and turned upright on a point in a diamond shape.
