September 22 is an important date to remember – it’s World Carfree Day (WCD). Celebrated in towns and cities all over the world, it’s a day when streets are closed to cars and open for pedestrians, pedalers, parties and pleasure. Eric Britton, a sustainability activist, international adviser and consultant on sustainable transportation, is recognised for his work promoting and propelling WCD to international attention. Much of his work involves co-ordinating the collaborative New Mobility Agenda and World Streets online journal, which encompass a number of possible transport solutions, including public transport, bike sharing and shared space projects. In an interview with Carbusters, Eric shared his thoughts about the problems, popularity and prospects for WCD, and points out the importance of bringing it into the policy agenda of governments in order to improve urban transport sustainability.