▁highway ▁is ▁one ▁of ▁the ▁major ▁back b ones ▁of ▁a ▁network ▁in ▁the ▁Great ▁L akes ▁region , ▁connecting ▁the ▁popul ous ▁Quebec ▁City – W inds or ▁cor rid or ▁with ▁Michigan , ▁New ▁York ▁and ▁central ▁Ontario ' s ▁c ott age ▁country . ▁It ▁is ▁the ▁principal ▁connection ▁between ▁Toronto ▁and ▁Montreal , ▁becoming ▁Autor oute   2 0 ▁at ▁the ▁Ontario – Que bec ▁border . ▁ ▁South western ▁Ontario ▁▁ ▁Highway   4 0 1 ▁does ▁not ▁yet ▁extend ▁the ▁last ▁few ▁kilometres ▁to ▁Detroit ; ▁an ▁extension ▁to ▁Bright on ▁Beach ▁( at ▁the ▁Canada – US ▁border ▁in ▁W inds or ) ▁was ▁completed ▁in ▁November ▁ 2 0 1 5 , ▁after ▁which ▁the ▁G ord ie ▁How e ▁International ▁Bridge ▁will ▁extend ▁Highway   4 0 1 ▁across ▁the ▁Canada – Un ited ▁States ▁border ▁to ▁a ▁connection ▁through ▁Del ray ▁to ▁Inter state ▁ 7 5 ▁in ▁Michigan ▁by ▁the ▁end ▁of ▁ 2 0 2 4 . ▁At ▁present , ▁Highway   4 0 1 ▁begins ▁as ▁a ▁six - lane ▁fre ew ay ▁at ▁the ▁west ▁end ▁of ▁the ▁E . ▁C . ▁Row ▁Express way . ▁At ▁the ▁Doug all ▁Park way , ▁the ▁highway ▁turns ▁east ▁and ▁ex its ▁W inds or . ▁From ▁here , ▁Highway   4 0 1 ▁mostly ▁par alle ls ▁the ▁former ▁route ▁of ▁Highway   9 8 ▁from ▁W inds or ▁to ▁T il bury . ▁ ▁South western ▁Ontario ▁is ▁flat