This document introduces the Mobility Policy Lab, which aims to help transport planners deal with uncertainty and develop user-centered mobility policies fit for the future. It does this through research, identifying user needs, co-creating strategies, testing strategies through projects, and validating results. The Lab takes an open and collaborative approach, engaging users at every stage and making all knowledge and tools freely available. It also seeks to build a community of organizations tackling mobility challenges. The document provides examples of the Lab's services and toolkit, including trend analysis, scenario planning, and games to experience different futures.