Abstract
The ATM (Autoritat del Transport Metropolita) is the solution that Barcelona and its metropolitan area have come up with in response to a problem that is common to all built-up urban areas - namely coordinating the urban and metropolitan mass transit systems and funding public transport. The purpose of this article is to review the achievements of ATM over a span of time that allows reflection upon its trajectory. This article discusses the infrastructure of the project, the new tramway network, the Mobility Master Plan of the Barcelona metropolitan region, and the development of an integrated fare system.