ing ▁system ; ▁however , ▁the ▁exit ▁number ▁system ▁similar ▁to ▁to ll ▁express ways ▁was ▁introduced ▁in ▁ 2 0 0 7 ▁exclus ively ▁for ▁Federal ▁Highway ▁route ▁ 2 ▁( then ▁followed ▁by ▁the ▁Put raj aya – Cy ber j aya ▁Express way ▁route ▁ 2 9 ); ▁thus ▁making ▁the ▁Federal ▁Highway ▁as ▁the ▁first ▁federal ▁express way ▁with ▁express way ▁exit ▁number ing ▁system . ▁ ▁Tun ▁Sal ah ud din ▁Bridge ▁E 2 4 ▁is ▁the ▁first ▁and ▁currently ▁the ▁only ▁to ll ▁express way ▁in ▁the ▁East ▁Malays ia , ▁while ▁almost ▁all ▁to ll ▁express ways ▁are ▁built ▁in ▁the ▁Pen ins ular ▁Malays ia . ▁The ▁Tun ▁Sal ah ud din ▁Bridge ▁is ▁also ▁the ▁only ▁to ll ▁express way ▁without ▁any ▁grade - separ ated ▁inter changes . ▁ ▁The ▁Mach ap ▁Rest ▁and ▁Service ▁Area ▁( n orth ▁bound ) ▁at ▁the ▁North – S outh ▁Express way ▁Southern ▁Route ▁E 2 ▁is ▁the ▁first ▁fully ▁air - condition ed ▁rest ▁area ▁in ▁Malays ia . ▁ ▁The ▁S ung ai ▁Per ak ▁Rest ▁and ▁Service ▁Area ▁( s outh ▁bound ) ▁at ▁the ▁North – S outh ▁Express way ▁Northern ▁Route ▁E 1 ▁in ▁Per ak ▁is ▁the ▁first ▁rest ▁and ▁service ▁area ▁in ▁the ▁Malays ian ▁express way ▁to ▁have ▁an ▁e co - management ▁theme ▁known ▁as ▁" The ▁Green ▁Tra il " ▁or ▁" J ej ak ▁Hij au ". ▁ ▁Put raj aya – Cy ber j