 During the mid @-@ 1970s , Highway 89 was extended east to Highway 11 at Fennell . This section was eventually returned to the jurisdiction of Simcoe County on April 1 , 1997 . During the spring of 2003 , the MTO renumbered several highways to improve route continuity . Among these was the renumbering of a section of Highway 89 between Harriston and Palmerston . The result of this renumbering was a shared terminus between Highway 89 and Highway 23 at an intersection with Highway 9 . 
