Question Where on a truck should placards be placed? Answers On the rear On the left and right sides On the front All of the above Explanation When hazardous materials placards are required, they must be placed on all four sides of the vehicle. This questions appears in the following tests: Connecticut Tank Florida HazMat Massachusetts HazMat Massachusetts HazMat New Jersey HazMat New York HazMat North Carolina HazMat North Dakota HazMat West Virginia HazMat