english: If you've been to Washington, DC or Japan or London, you know that metro riders there will be very careful to stand on the right-hand side of the escalator so that people can go by on the left.
non_english: Als je in Washington of Japan  of Londen bent geweest, weet je dat metroreizigers daar hun best doen om aan de rechterkant van de roltrap te staan zodat mensen er links langs kunnen.