Legible London is a citywide wayfinding system for London, operated by Transport for London (TfL). The system is designed to provide a consistent visual language and wayfinding system across the city, allowing visitors and local residents to easily gain local geographic knowledge regardless of the area they are in. It is the world's largest municipal wayfinding system. In addition to the on-street signs, Legible London maps appear in all London Underground (Tube) stations, Docklands Light Railway stations, and on bus shelters, as well as on Barclays Cycle Hire docking stations and the Barclays Cycle Superhighways commuter cycle routes. Design The Legible London system comprises three sizes of sign, the "Monolith", "Midilith", and "Minilith", made of a mixture of vitreous enamel and vinyl printed glass materials within a stainless steel frame. The signs have a bright yellow stripe on top of the panels with the walking person icon, intended to make them easier to spot within the urban environment and when viewed from a distance. Two maps, a "planner map" and a "finder map", are displayed on the majority of signs, one per side. In some cases the signs are one-sided due to the constraints of their placement. Both planner and finder maps show "walking circles" to place the user in the context of his or her surroundings. The planner map displays a circle indicating the range of 15 minutes' walking, indicated as , while the finder map shows one for 5 minutes' walking, indicated as . The distances are based on an average walking pace of . The maps are illustrated in 2D with significant landmarks shown in 3D, helping users to identify the urban environment. For the same reason the maps are oriented in the direction that the reader is facing, rather than with north at the top. TfL is currently developing prototype digital signs for Legible London, with a static map on one side and an interactive touchscreen display on the other. History In 2004, the then Mayor of London, Ken Livingstone declared that he would make London a walkable city by 2015. Subsequently, a project manager from the London Borough of Camden, as part of the Clear Zone Partnership, was sent to a walking conference in Bristol to study the Bristol Legible City signage system. He then championed a London version of the Bristol Legible City signs to the Central London Partnership. The London Borough of Camden