In Europe, the idea that coordinating transport and urban planning is a necessary condition for setting sustainable urban development into motion has spread throughout academic and professional circles. If there is nothing new regarding this concern, the objectives underlying transport and urban planning coordination have deeply changed since the late 1960s. How has the shift in perspective, from adapting the city to the automobile toward promoting sustainable cities and mobilities, been translated into action? And what of local issues, visions, and coordination practices surrounding transportation and urban planning? What factors favor this kind of integration, and can we identify sources of inertia and causes of public action fragmentation? Based on a comparative study of four urban area's transport policy and urban planning trajectories (Geneva, Bern, Strasbourg and Bordeaux), this paper analyses the coordination between transport and urban planning as a political process in permanent (re)construction.