An emergency ordinance or resolution is an ordinance or resolution for the immediate preservation of the public peace, health, or safety, in which the emergency is defined or declared in a preamble thereto, separately voted upon, and agreed to by at least four members of the council, as recorded by ayes and noes. An emergency ordinance or resolution must be in writing but may be enacted without previous filing or publication. No grant of any franchise shall be construed to be an emergency ordinance or resolution.