ission ed ▁in ▁ 2 0 0 8 . ▁ ▁Tol led ▁high ways ▁that ▁existed ▁before ▁the ▁Inter state ▁Highway ▁System ▁are ▁ex empt ▁from ▁Inter state ▁standards ▁despite ▁being ▁designated ▁as ▁Inter state ▁high ways . ▁Many ▁such ▁to ll ▁roads ▁( part icular ly ▁the ▁Pennsylvania ▁Turn pi ke ) ▁remain ▁as ▁such . ▁However , ▁to l led ▁high ways ▁built ▁since ▁the ▁Inter state ▁system , ▁such ▁as ▁the ▁to l led ▁section ▁of ▁PA ▁Route ▁ 6 0 ▁and ▁PA ▁Turn pi ke ▁ 5 7 6 , ▁must ▁be ▁built ▁or ▁upgrad ed ▁to ▁Inter state ▁standards ▁before ▁receiving ▁Inter state ▁design ation . ▁Both ▁high ways ▁are ▁to ▁be ▁part ▁of ▁the ▁Inter state ▁system , ▁with ▁PA ▁ 6 0 ▁now ▁I - 3 7 6 ▁and ▁PA ▁Turn pi ke ▁ 5 7 6 ▁to ▁become ▁I - 5 7 6 ▁in ▁the ▁near ▁future . ▁As ▁well , ▁U . S . ▁Inter state ▁Highway ▁standards ▁mand ate ▁a ▁minimum ▁ 1 1 - foot ▁median ; ▁however , ▁high ways ▁built ▁before ▁those ▁standards ▁have ▁been ▁grand father ed ▁into ▁the ▁system . ▁The ▁Kansas ▁Turn pi ke ▁is ▁the ▁most ▁notable ▁example , ▁as ▁it ▁has ▁been ▁retro f itted ▁with ▁a ▁Jersey ▁bar rier ▁along ▁its ▁entire ▁ 2 3 6 - mile ▁( 3 8 0 - km ) ▁length . ▁ ▁The ▁earliest ▁Ontario ▁ 4 0 0 - series ▁high ways ▁and ▁other ▁express ways ▁do