Whenever the location of any state aid or town way that was designated as a 3rd class highway at the time that the 3rd class highway designations were rescinded is changed, added to, discontinued or a new location is established by a town or city, the municipal officers of said town or city shall notify the county commissioners of the county of which said town or city is a part of such change with an accurate description of the courses and distances, within 3 months from such action.
23 M.R.S. § 2951