something that you can use to travel on all kinds of London transport an Oyster card very long single-decker buses bendy buses buses that have two levels double-decker buses the person who collects the money from the passengers bus conductor buses that have only one level single-decker buses an old kind of double-decker bus that's open at the back Routemaster buses http://500ab102e3079df093a4-ff8eeadd950d51fd1fc939dca75b3973.r47.cf1.rackcdn.com/assets_green.swf