Question Where must placards be placed? Answers Only on the front of a vehicle On the front, back and both sides of a vehicle Only on the driver’s side of a vehicle Only on the passenger's side of the vehicle Explanation If a vehicle is carrying hazardous materials that require placarding, there must be identical placards placed on the front, rear, and both sides of the vehicle. Take a FREE Practice Test Now This questions appears in the following tests: Connecticut Double ,