This paper deals with the automobilism as a theme of urban history. It treats the technical, social and cultural aspects of the impact of the “car-system” considered as a technical system. It shows how the Capital city of France has invented a new way of urbanity at the beginning of the XX th century. The motorisation of the haussmannian avenues, streets and places revealed the creation of a new « habitus », a new and modernized way of living Paris everyday life. As far as the chronology is concerned, from the origin of the car until the 1 st World War, the paper makes a clear distinction between, on the one hand, the “first world” of the car, the one of its production, and, on the other hand, the “second world” of the car, the one of its uses. It describes the club of the first Parisian car-owners, before detailing how the car expanded in the same time throughout the whole society. This first democratic early turning point reveals how the car, which quickly ruled the Parisian roadway, served the city through its commercial and professional uses. Who were the main actors in this initially restricted world ? Which were the main events by which their influence spread ? What were their concerns ? How did they manage to impact on a global scale ?