▁US   6 ▁cor rid or , ▁which ▁continues ▁to ▁follow ▁Clear ▁Creek ▁through ▁a ▁narrow , ▁cur ving ▁g orge . ▁The ▁inter state , ▁however , ▁follows ▁the ▁cor rid or ▁of ▁US   4 0 ▁out ▁of ▁the ▁can y on . ▁The ▁highway ▁cr ests ▁a ▁small ▁mountain ▁near ▁Gen ese e ▁Park ▁to ▁descend ▁into ▁Mount ▁Vern on ▁C any on ▁to ▁exit ▁the ▁Rock y ▁Mountains . ▁This ▁portion ▁features ▁grade - warning ▁signs ▁with ▁unusual ▁messages , ▁such ▁as ▁" T ru cks : ▁Don ' t ▁be ▁foo led ," ▁" T ruck ers , ▁you ▁are ▁not ▁down ▁yet ," ▁and ▁" Are ▁your ▁bra kes ▁adjust ed ▁and ▁cool ?" ▁Run away ▁tr uck ▁ram ps ▁are ▁a ▁prominent ▁feature ▁along ▁this ▁portion ▁of ▁I - 7 0 , ▁with ▁a ▁total ▁of ▁seven ▁used ▁along ▁the ▁descent ▁of ▁either ▁side ▁the ▁Cont inental ▁Div ide ▁to ▁stop ▁tr uck s ▁with ▁failed ▁bra kes . ▁ ▁The ▁last ▁ge ographic ▁feature ▁of ▁the ▁Rock y ▁Mountains ▁travers ed ▁before ▁the ▁highway ▁reaches ▁the ▁Great ▁Pla ins ▁is ▁the ▁Dak ota ▁Hog back . ▁The ▁path ▁through ▁the ▁h og back ▁features ▁a ▁massive ▁cut ▁that ▁ex poses ▁various ▁layers ▁of ▁rock ▁millions ▁of ▁years ▁old . ▁The ▁site ▁includes ▁a ▁nature ▁study ▁area ▁for ▁visitors . ▁ ▁Great ▁Pla ins ▁As ▁the ▁fre ew ay ▁passes ▁from ▁the ▁Rock y ▁Mountains ▁to ▁the ▁Great ▁Pla ins , ▁I - 7 0 ▁enters