Question Placards must be placed: Answers In any manner, as long as they are visible. So words and numbers are read from left to right. Upside down. Within three inches of other markings. Explanation Hazardous materials placards must be positioned so any words or numbers can be read from left to right. They must be at least three inches away from any other markings. Take a FREE Practice Test Now This questions appears in the following tests: Colorado HazMat , Massachusetts HazMat , Wisconsin HazMat , North Carolina Tank ,