London Buses route 15 is a Transport for London contracted bus route in London, United Kingdom. The service is currently contracted to Stagecoach London. Heritage route 15 operates using traditional Routemaster buses over a shortened version of the standard route.
Route 15 is a very popular route with tourists as it passes places such as Trafalgar Square, Aldwych, St. Paul's Cathedral, Piccadilly Circus and terminates at Regent Street which is a short walk away from Oxford Street.
More information on the Wikipedia page