To deliver on its Green Deal and become climate neutral by 2050, the European Union (EU) must reduce transport-related greenhouse gas (GHG) emissions by 90% (EC, 2019). This is a colossalchallenge. Transport is one of the few sectors in which emissions are higher today than in 1990 and despite mitigation efforts they are still rising. Cities are crucial to achieving this ambitious goal, as they account for 40% of total road transport in the EU (EC, 2020). But cities are not just major emitters; local governments and urban stakeholders are also driving the transition to sustainable mobility through urban experimentation and innovation and new multistakeholder partnerships.