Roadie is a mobile application designed for those who want to discover Milan by bike during Expo 2015. It suggests random thematic itineraries that make the user discover the city. Journeys are purposed depending on the user's profile and settings: every rider can choose the theme as well as the time and length of the root. Through the earphones, the vocal guide leads the user through the city, providing infos about the journey stops. At the end of the root the user can give a feedback or record a vocal note, so other users will be able to listen to his suggestions.