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Transport: The centre of Sofia is easily accessible by public transport, which includes buses, trams and trolleybuses. Buses run from 5am until midnight and until 1am for trams. Single trip tickets can be purchased before boarding as well as on the vehicle and must be punched once aboard. It is not practical to travel into or around the city centre by car as parking spaces are limited and traffic can be a problem. Taxis are also easily available