BI ▁will ▁also ▁investigate ▁if ▁there ▁is ▁any ▁involved ▁criminal ▁actions . ▁ ▁State ▁Rout es ▁ ▁Colorado ▁maintain s ▁state ▁high ways ▁for ▁high - volume ▁travel ▁routes ▁that ▁do ▁not ▁qual ify ▁for ▁federal ▁fund ing . ▁ ▁B uses ▁and ▁mass ▁trans it ▁ ▁Den ver ' s ▁Regional ▁Transport ation ▁District , ▁known ▁locally ▁as ▁R TD , ▁is ▁the ▁largest ▁public ▁transport ation ▁system ▁in ▁Colorado . ▁The ▁R TD ▁system ▁provides ▁bus , ▁light ▁rail , ▁and ▁comm uter ▁rail ▁transport ation ▁services ▁in ▁the ▁majority ▁of ▁the ▁Den ver - A ur ora - B ould er ▁Com b ined ▁Statist ical ▁Area . ▁Through ▁its ▁F as Tra cks ▁initi ative , ▁R TD ▁is ▁working ▁to ▁rapidly ▁build ▁light ▁rail ▁and ▁bus ▁rapid ▁trans it . ▁ ▁Other ▁transport ation ▁services ▁exist ▁throughout ▁the ▁state . ▁Some ▁systems , ▁such ▁as ▁in ▁Colorado ▁Spr ings , ▁focus ▁on ▁the ▁local ▁area . ▁Other ▁systems , ▁such ▁as ▁that ▁found ▁on ▁the ▁Western ▁Slo pe ▁connecting ▁Glen wood ▁Spr ings , ▁Asp en , ▁and ▁Car b ond ale ▁offer ▁inter - city ▁connections . ▁ ▁Den ver ▁and ▁Colorado ▁Spr ings ▁are ▁serv iced ▁by ▁the ▁F RE X ▁regional ▁bus . ▁Fort ▁Collins , ▁Lov eland , ▁Ber th oud , ▁and ▁Long mont ▁are ▁serv iced ▁by ▁the ▁F LE X ▁regional ▁bus . ▁ ▁Air ▁transport ation ▁ ▁Den ver ▁International ▁Airport ▁handles ▁the ▁majority ▁of ▁air ▁traffic ▁in ▁Colorado ▁and