Front Range Express (FREX - stylized frex) was a commuter bus service that began in 2004 and operating between the cities of Colorado Springs and Denver, with stops along the way in Greenwood Village, Monument and Castle Rock in Colorado, USA. FREX operated on Interstate 25 except when exiting to make stops at each city. FREX served the southern portion of the Colorado Front Range and during its tenure was operated via different contracts by Veolia Transport & Laidlaw Transit. It was added as a part of Mountain Metropolitan Transit, which serves the Colorado Springs and El Paso County areas. In 2005, annual ridership was 118,389 and daily ridership was 464.