CUE Bus (City-University-Energysaver) is a bus service operated by the City of Fairfax, Virginia, and is completely separate from the Fairfax Connector bus service run by Fairfax County. CUE operates two loop routes between George Mason University and the Vienna Metro station, each running in both directions for a total of four named routes. The Green loop, consisting of routes Green 1 (clockwise) and Green 2 (counterclockwise) operates on the east side of Fairfax, while the Gold loop, consisting of routes Gold 1 (clockwise) and Gold 2 (counterclockwise) operates on the west side.