▁Inter state ▁standards , ▁as ▁it ▁has ▁two ▁narrow ▁lan es , ▁no ▁shoulder , ▁and ▁a ▁ 5 0 ▁mile - per - hour ▁( 8 0   km / h ) ▁speed ▁limit . ▁ ▁I - 7 4 ▁bridge ▁replacement ▁ ▁The ▁I - 7 4 ▁Cor rid or ▁Study ▁was ▁completed ▁to ▁study ▁replacing ▁the ▁bridge ▁with ▁a ▁larger ▁one ▁with ▁ 4 ▁lan es ▁in ▁each ▁direction . ▁The ▁study ▁claimed ▁that ▁the ▁I - 7 4 ▁Bridge ▁project ▁would ▁sp ur ▁economic ▁growth , ▁create ▁construction ▁jobs , ▁reduce ▁traffic ▁back ups , ▁and ▁improve ▁air ▁quality . ▁ ▁Fund ing ▁for ▁the ▁construction ▁of ▁the ▁new ▁bridge ▁has ▁been ▁ear mark ed ▁for ▁$ 2 2 ▁million ▁in ▁ 2 0 1 7 ▁and ▁$ 5 0 ▁million ▁in ▁ 2 0 1 8 . ▁Form er ▁Illinois ▁Governor ▁Pat ▁Qu inn ▁said ▁the ▁state ▁is ▁committed ▁to ▁bridge ▁improvements ▁to ▁help ▁traffic ▁flow ▁and ▁" boost ▁economic ▁growth ▁in ▁the ▁region ". ▁ ▁As ▁of ▁ 2 0 1 2 , ▁the ▁Illinois ▁Department ▁of ▁Transport ation ▁also ▁budget ed ▁more ▁than ▁$ 3 4 ▁million ▁for ▁engineering , ▁design ▁and ▁land ▁ac quisition ▁for ▁the ▁new ▁bridge . ▁ ▁The ▁concept ual ▁design ▁of ▁the ▁arch ▁bridge ▁was ▁completed ▁by ▁Boston - based ▁bridge ▁designer ▁Miguel ▁Ros ales ▁from ▁Ros ales ▁+ ▁Part ners . ▁Final ▁design ▁was ▁completed ▁by ▁Mod jes ki ▁and ▁Masters ▁in ▁association ▁with ▁Alfred ▁Ben esch ▁& ▁Company .