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 Is Falling Down then adapted to fit the most famous bridge in England. One of the earliest references to the rhyme in English is in the comedy "The London Chaunticleres", printed in 1657, but probably written about 1636, in which the dairy woman Curds states that she had "danced the building of London-Bridge" at the Whitsun Ales in her youth, although no words or actions are mentioned. Widespread familiarity with the rhyme is suggested by its use by Henry Carey in his satire "Namby Pamby" (1725), as: <poem>"Namby Pamby" is no Clown, London Bridge is broken down: Now he courts the gay Ladee