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,
Schenley Bridge the land for Schenley Park, a temporary trestle was constructed across Junction Hollow. The present Schenley Bridge replaced this structure in 1897. One of the original plans was to remove the temporary trestle and re-erect it over Panther Hollow. It has been speculated that the fire which destroyed the Schenley Park Casino near the temporary bridge was also a factor leading to the erection of a wholly new bridge at Panther Hollow. As built, the Schenley Bridge and the Panther Hollow Bridge are near twins—built concurrently. Schenley Bridge and a boiler plant dubbed the Cloud Factory, sited just northeast of