Complex sentence: There are five existing major routes from Chicago to Peoria; the four shortest require Peoria-to-Chicago traffic to divert from major interstates, and the fifth all-interstate option adds approximately to a trip.
Split into simpler sentences: There are five existing major routes from Chicago to Peoria. The four shortest require Peoria-to-Chicago traffic to divert from major interstates, and the fifth all-interstate option adds approximately to a trip.