Three, Four, and Seven day passes are also available if purchased in the U.S. before departure. If you need unrestricted access to the bus system, purchase an LT Card for a slightly higher fee. If your bus route isn't running at night, head over to Trafalgar Square and grab the night bus. It covers most of the city and has frequent stops. Because of the extensive coverage, you should plan on any trip on the night bus to be a lengthy one.
Routes are clearly marked, stations are clean, and connections are frequent and easy.
This is by far the preferred method of travel for natives, and is a favorite of visitors too. There are 11 Underground lines and they are color coded. To purchase a ticket you can either stand on line or use one of the automated ticket machines. Much like the bus system, fares work on a zone basis and you can purchase One Day Passes. Weekly and Monthly Passes are also available.