Whenever the location of any state, state aid or town way that was designated as a 3rd class highway at the time the 3rd class highway designations were rescinded is changed, added to, discontinued or a new location is established within a county, the county commissioners of said county shall place on file the description of such change and shall notify the Department of Transportation of such change with an accurate description of the courses and distances within 3 months from such action. Whenever the department has previous record of such action, no notification by the county commissioners to the department shall be deemed necessary. [PL 1971, c. 593, §22 (AMD).]