Question How many identical placards must be placed on a vehicle? Answers Three Two Four Explanation A placarded vehicle must have at least four identical placards: one on the front, one on the rear, and one on each side of the vehicle. Take a FREE Practice Test Now This questions appears in the following tests: Iowa HazMat , Ohio HazMat , Oklahoma HazMat , Rhode Island HazMat , South Carolina HazMat , Tennessee HazMat , Virginia HazMat , Washington HazMat , Hawaii Tank ,