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,
Albert Bridge, London reduce traffic flow and prolong the life of the bridge, in 2009 it carried approximately 19,000 vehicles per day, the lowest usage of any Thames road bridge in London other than the little-used Southwark Bridge. The bridge was closed to motor vehicles on 15 February 2010 for refurbishment and strengthening. It was originally expected to remain closed for approximately 18 months, but after the condition of the bridge was found to be worse than expected, it was closed for 22 months. All of the timber in the decking as well as the footway that had rotted away were replaced, with