How many classes of hazardous materials are there? 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 How many classes of hazardous materials are there? Answers One Three Six Nine Explanation A hazardous material will be placed into one of nine classes to explain the type of risks associated with the material. This questions appears in the following tests: Colorado Passenger Minnesota Passenger Mississippi Bus New York Bus New York Bus Texas Passenger