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,
Richmond Bridge, London from its general west to east direction, flowing from southeast to northwest in this part of London, what would otherwise be known as the north and south banks are often referred to as the "Middlesex" (Twickenham) and "Surrey" (Richmond) banks respectively, named after the historic counties to which each side once belonged. The bridge was widened and slightly flattened in 1937–40, but otherwise still conforms to its original design. The eighth Thames bridge to be built in what is now Greater London, it is today the oldest surviving Thames bridge in London. The small town of Sheen on the Surrey