While the Bustang goes between Denver and the Western Slope, the local bus transportation solution is brought to you by RFTA. RFTA stands for Roaring Fork Transportation Authority. Since RFTA somewhat sort of sounds like Raptor- the mascot for the bus system is a cute green dinosaur running- the veloci-raptor. Anyway, its a bus system. I would get to know it because sometimes parking can be scarce or strict in Aspen. Also if you need to move between towns commuting.