uck ▁driver ▁did ▁not ▁follow ▁a ▁recommended ▁route ▁provided ▁by ▁state ▁tro op ers , ▁who ▁specifically ▁war ned ▁the ▁driver ▁to ▁avoid ▁the ▁M ous et rap . ▁The ▁Navy ▁promised ▁re forms ▁after ▁being ▁critic ized ▁for ▁providing ▁an ▁un st aff ed ▁phone ▁number ▁with ▁a ▁ha z ard ous ▁cargo ▁ship ment , ▁a ▁viol ation ▁of ▁federal ▁law , ▁and ▁failing ▁to ▁notify ▁Den ver ▁officials ▁about ▁the ▁ship ment . ▁The ▁M ous et rap ▁was ▁grand father ed ▁into ▁the ▁Inter state ▁Highway ▁system , ▁with ▁some ▁structures ▁built ▁in ▁ 1 9 5 1 . ▁The ▁incident ▁provided ▁momentum ▁to ▁re build ▁the ▁inter change ▁with ▁a ▁more ▁modern ▁and ▁sa fer ▁design . ▁Const ruction ▁began ▁in ▁several ▁phases ▁in ▁ 1 9 8 7 ▁and ▁the ▁last ▁bridge ▁was ▁dedicated ▁in ▁ 2 0 0 3 . ▁ ▁In ▁ 2 0 1 4 , ▁mile ▁marker ▁ 4 2 0 ▁was ▁alter ed ▁by ▁CD OT ▁to ▁read ▁" M ile ▁ 4 1 9 . 9 9 " ▁following ▁repeat ▁the ft s ▁of ▁the ▁original ▁sign ▁due ▁to ▁the ▁significance ▁of ▁the ▁number ▁ 4 2 0 ▁in ▁can nab is ▁culture . ▁ ▁Future ▁CD OT ▁plans ▁to ▁re build ▁the ▁ ▁elev ated ▁section ▁of ▁I - 7 0 ▁between ▁Bright on ▁Bou lev ard ▁and ▁Colorado ▁Bou lev ard ▁in ▁Den ver ▁as ▁a ▁below - grade ▁highway ▁and ▁w iden ▁other ▁sections ▁between ▁I - 2