rock ville ▁section ▁was ▁by pass ed ▁and ▁the ▁final ▁intersection ▁grade - separ ated ▁near ▁King ston , ▁making ▁Highway   4 0 1 ▁a ▁fre ew ay ▁for ▁its ▁entire ▁ 8 1 7 . 9 - km ▁length . ▁On ▁August ▁ 2 4 , ▁ 2 0 0 7 , ▁the ▁portion ▁of ▁the ▁highway ▁between ▁ ▁Miller ▁Road ▁in ▁Tr ent on ▁and ▁the ▁Don ▁Valley ▁Park way   / ▁Highway   4 0 4 ▁J unction ▁in ▁Toronto ▁was ▁designated ▁the ▁Highway ▁of ▁Hero es , ▁as ▁the ▁road ▁is ▁travel led ▁by ▁fun eral ▁con vo ys ▁for ▁fallen ▁Canadian ▁Forces ▁personnel ▁from ▁CF B ▁Tr ent on ▁to ▁the ▁coron er ' s ▁office ▁in ▁Toronto . ▁On ▁September ▁ 2 7 , ▁ 2 0 1 3 , ▁the ▁Highway ▁of ▁Hero es ▁design ation ▁was ▁extended ▁west ▁to ▁K ee le ▁Street ▁in ▁Toronto , ▁to ▁co inci de ▁with ▁the ▁move ▁of ▁the ▁coron er ' s ▁office ▁to ▁the ▁new ▁For ens ic ▁Services ▁and ▁Cor on er ' s ▁Complex ▁at ▁the ▁H umber ▁River ▁Hospital . ▁ ▁In ▁ 2 0 1 1 , ▁construction ▁began ▁on ▁a ▁west ward ▁extension ▁called ▁the ▁" R t . ▁Hon . ▁Her b ▁Gray ▁Park way ". ▁This ▁new ▁route ▁follows ▁but ▁does ▁not ▁replace , ▁the ▁former ▁Highway   3 ▁between ▁the ▁former ▁end ▁of ▁the ▁fre ew ay ▁and ▁the ▁E . ▁C . ▁Row ▁Express way , ▁at