A. Whenever the City Council determines, upon the basis of a structural engineering investigation, that the structure of a bridge on a highway is such that it is unsafe for vehicles over a certain weight to use such bridge, the City Council shall by resolution direct the City Engineer to place signs at both entrances to such bridge specifying the maximum gross weight limits of any vehicle or combination of vehicles which shall be permitted to cross such bridge.
B. Whenever the City Council finds, because of rebuilding, repairing or strengthening such bridge, that such weight limits are no longer necessary, the City Council shall by resolution direct the City Engineer to remove such weight limit signs from the entrances to such bridge.