Cet article a bénéficié du soutien de ANR dans le cadre du projet TransEnergy (décision d’aide n° ANR-2010-VILL-004-01).In a context of strong financial, environmental and energy constraints, to reduce theconsumption of fossil energy in the field of transport becomes not only an emergency butimposes a paradigm shift in terms of transport policy. It is not sufficient today to improvethe supply, to target travel demand and stimulate behavior change becomes necessary.In particular, commuting structuring mobility practices also strongly contributes to CO2emissions. By combining census data and household travel surveys in two different urbanareas, Lille and Lyon, our aim is first to measure the CO2 emissions related to commuting andsecondly, to ...