Placards showing the type of hazardous materials in a vehicle are usually shaped like what? Question Placards showing the type of hazardous materials in a vehicle are usually shaped like what? Answers An octagon A circle A diamond Explanation Hazardous materials warning placards are diamond-shaped. This questions appears in the following tests: Alabama HazMat Alabama HazMat Alaska HazMat California HazMat Hawaii HazMat Hawaii HazMat Maine HazMat Minnesota Tank Missouri HazMat Nevada HazMat New Mexico HazMat Ohio HazMat Rhode Island HazMat Vermont HazMat Wyoming HazMat
