Millennium Bridge, London people walking caused small sideways oscillations in the bridge, which in turn caused people on the bridge to sway in step, increasing the amplitude of the bridge oscillations and continually reinforcing the effect. On the day of opening, the bridge was crossed by 90,000 people, with up to 2,000 on the bridge at any one time. Resonant vibrational modes due to vertical loads (such as trains, traffic, pedestrians) and wind loads are well understood in bridge design. In the case of the Millennium Bridge, because the lateral motion caused the pedestrians loading the bridge to directly participate with the bridge,
London Bridge Area Signalling Centre London Bridge Area Signalling Centre London Bridge Area Signalling Centre (ASC) is a signalling centre on the Kent Route of Network Rail Ltd. on the railway in Great Britain, principally covering the line from London (Charing Cross, Cannon Street and London Bridge) to Kent and Sussex route areas of Network Rail Ltd. The signalling centre opened in 1974. During 1974/75, the first section of the control panel in London Bridge ASC was commissioned, gradually replacing redundant signalling locations in the area and principally replacing the old 1923-built London Bridge signal box. Railway track layouts were altered to separate Cannon Street,