Any sign projecting over a roadway right-of-way at the time of the effective date of this Outdoor Advertising Sign Code which was subject to removal or relocation at the owner's expense, pursuant to a permit or other ordinance of the town, shall be removed by the owner, or altered at the owner's expense to comply with the regulations of this Outdoor Advertising Sign Code if, as the result of, or after completion of a roadway improvement project, that sign does not or would not comply with the provisions of this Outdoor Advertising Sign Code.