Charting the development of the travel plan as a concept, this book draws on a range of research-based contributions to determine the state-of-the-art and to explore a series of future scenarios in this area for practitioners and policy makers. Site-based mobility management or 'travel plans' address the transport problem by engaging with those organisations such as employers that are directly responsible for generating the demand for travel, and hence have the potential to have a major impact on transport policy. To do this effectively however, travel plans need to be reoriented to be made more relevant to the needs of these organisations, whilst the policy framework in which they operate needs modifying to better support their diffusion and enhance their effectiveness. Marcus Enoch breaks down the travel plan concept into four axes related to its development (namely segment, scale, structure and support), and investigates the following questions: - What makes them special? - Why are they introduced? - What do they look like in terms of their design and the measures they use? - How common are they and in what sectors and location types? - How effective are they? - What barriers do they face and how might these be overcome?