prior to the construction of i-80, sr-4 (us-189) passed through coalville on main street. to retain access to the town once i-80 replaced the surface road, the state road commission designated state route 280 in 1961 as a short connection between i-80 and main street on icy springs road (100 south). before serving its intended purpose, the road briefly formed part of sr-2 (which had replaced sr-4 in 1962) and us-189, since i-80 was completed west of sr-280 before the portion east to echo opened. a temporary ramp left the right side of sr-280 where the ramp to i-80 east now begins, and curved left into the westbound lanes of i-80 just before the interstate crosses under sr-280.