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 and demand for the new bridge was less than expected. In the first nine months of its operation £2,085 (about £ in 2019) were taken in tolls. In 1877 the Metropolis Toll Bridges Act was passed, which allowed the Metropolitan Board of Works to buy all London bridges between Hammersmith and Waterloo bridges and free them from tolls. In 1879, Albert Bridge, which had cost £200,000 to build, was bought by the Board of Works along with Battersea Bridge for a combined price of £170,000 (about £ in 2019). The tolls were removed from both bridges on 24 May 1879,