The Deep Decarbonization Pathways for Transport (DDP-T) project analyzes Paris-compatible sectoral strategies for the passenger transport that can serve to inform the 2018 Facilitative Dialogue and the preparation of future, more ambitious, NDCs by 2020. The project adopts an integrated approach of sectoral deep decarbonization strategies articulating the diffusion of low-carbon technologies with the future of mobility and all its drivers. Building on four country analyses (France, Japan, Mexico and the United Kingdom), this Issue Brief derives five cross-cutting messages for a deep decarbonization of the passenger transport sector.