Question Placards must be placed: Answers Within three inches of other markings. So words or numbers are read from left to right. Upside down. Explanation Hazardous materials placards must be placed on a vehicle at least three inches away from any other markings and must positioned so that the words or numbers are level and read from left to right. This questions appears in the following tests: Arizona HazMat Idaho HazMat Iowa HazMat Iowa HazMat Iowa Tank Kentucky Tank Mississippi HazMat Virginia HazMat