London's Routemaster, which has been in service since the early 1960s, is an open platform doubledecker bus. As the driver is completely separated from the passengers, it requires a conductor. Routemasters are popular with Londoners and tourists alike, and Ken Livingstone, Mayor of London, guaranteed their use for years to come. For many people, Routemaster buses evoke nostalgic feelings. See also the film On the Buses.