The Director of Finance, upon the issuance of a vehicle license, shall issue a decalcomania device in the form of a sticker, or a metal plate where the sticker cannot be used, bearing the number and name or class to which such vehicle belongs and the year for which such license is issued. In the case of automobiles having a windshield, the licensee shall attach the decalcomania device to the lower right-hand corner of the windshield in such a manner as to be easily read from the outside. In the case of motorcycles or motor tricycles, the license plate shall be placed at the rear thereof. Any person carrying a license plate or decalcomania device on his vehicle shall keep the same clear of dust and mud so that the same can be plainly seen at all times.
(1997 Code, § 40.05)