From the Town of Vail Website:
The Town of Vail Transit Department provides free year-round bus service throughout Vail. In fact, the town’s bus service is considered to be the largest free transportation system in the country offering its residents and guests timely service to and from Vail Mountain and throughout town.
Vail also provides real-time arrival information to passengers within the Vail Village, LionsHead and Golden Peak corridor. The real-time information is provided by NextBus Information Systems, which uses Global Positioning Satellite (GPS) technology to track buses while en route and then transmits the information to the Internet and digital bus signs. Vail is one of the only ski towns in North America to offer its passengers this technology.
Additionally, regional bus service with modest fares is provided daily by ECO Transit with service to Vail, Leadville, Minturn, Eagle-Vail, Avon, Edwards, Eagle and Gypsum.