After extensive analysis by the engineers, the problem was fixed by fitting 37 dampers (energy dissipating) to control horizontal movement and 52 (inertial) dampers to control vertical movement. This took from May 2001 to January 2002 and cost £5M. After a period of testing, the bridge was successfully re-opened on 22 February 2002. The bridge has not been subject to significant vibration since. In spite of the successful fix of the problem, the affectionate 'wobbly bridge' epithet remains in common usage amongst Londoners.