October 2011: The work entails replacing two of the longest hangers, which are 12 metres and 14 metres long and together weigh around a third of a tonne. They were hoisted into position using a cherry-picker. Straps with strain gauges held the strain while each rod was removed. A further eight hangers are being replaced without the need to disrupt traffic.
 |  Note the bridge spanner being put to good use, and the strain gauges at the base of each of the two straps used to take th |