This document deals at transport and mobility policies in the Île-de-France region and the sustainability objectives set by the master plans (SDRIF, PDUIF). Socio-ecological transformations call for an overhaul of regional strategies, going far beyond transport policies alone. In particular, we believe that only by coordinating affordable housing, regional planning and mobility policies, while taking into account socio-spatial inequalities, will we be able to take an ambitious and proactive approach to the levers of sobriety. Reinforcing the logic of proximity, including in outlying areas, and regulating the movement of goods (in line with the explosion in e-commerce) are two major objectives to be taken into account in this reflection.