▁( although ▁not ▁as ▁high ▁as ▁the ▁express way ▁speed ▁limit ) ▁of ▁ 1 0 0   km / h , ▁allowing ▁the ▁maximum ▁speed ▁limit ▁of ▁ 9 0   km / h . ▁The ▁high ways ▁are ▁built ▁with ▁partial ▁access ▁control , ▁and ▁grade - spe ar ated ▁inter changes ▁and ▁at - grade ▁cross ings ▁are ▁both ▁permitted . ▁However , ▁it ▁is ▁possible ▁for ▁a ▁federal ▁or ▁state ▁highway ▁to ▁be ▁built ▁with ▁almost ▁equivalent ▁standard ▁of ▁an ▁express way ▁with ▁the ▁exception ▁of ▁lower ▁speed ▁limit , ▁for ▁example ▁the ▁Federal ▁Highway . ▁High ways ▁can ▁be ▁built ▁either ▁as ▁dual - car riage way ▁or ▁two - lane ▁single ▁carriage way . ▁ ▁Before ▁the ▁mid - 1 9 9 0 s , ▁there ▁were ▁no ▁specific ▁coding ▁system ▁for ▁the ▁express ways . ▁When ▁more ▁and ▁more ▁express ways ▁were ▁built , ▁a ▁system ▁of ▁express way ▁number ing ▁was ▁applied ▁to ▁all ▁express ways . ▁Express ways ▁are ▁label led ▁with ▁the ▁letter ▁" E " ▁followed ▁by ▁assigned ▁numbers , ▁for ▁example ▁the ▁code ▁for ▁North – S outh ▁Express way ▁southern ▁route ▁is ▁E 2 . ▁The ▁express ways ▁have ▁green ▁signs ▁and ▁the ▁text ▁colour ▁is ▁white . ▁ ▁However , ▁there ▁are ▁some ▁exceptions ▁in ▁some ▁high ways . ▁Some ▁high ways ▁like ▁Federal ▁Highway ▁( F eder al ▁Route ▁ 2 ) ▁and ▁Sk ud ai ▁Highway ▁( F eder al ▁Route ▁ 1 ) ▁retain ▁their ▁federal