Completed in 1961, the Hammersmith flyover carries the four-lane A4 arterial road over the Hammersmith gyratory and links the west to central London.
Strengthening the flyover will prolong its life and mean no major maintenance will be required for many years. Work to upgrade the central reservation and to strengthen the structure is now complete.
The work forms part of the Road Modernisation Plan. Consisting of hundreds of projects to transform junctions, bridges, tunnels and pedestrian areas, it is the biggest investment in London's roads for a generation.
In addition to installing new steel cables to strengthen the flyover, we have also successfully replaced all the bearings which allow the flyover move as the temperature varies.
We have also installed a new permanent expansion joint. This replaces the temporary joint which had allowed work to take place at the joint during night closures, but also let traffic cross the flyover during the day.
The remaining works will see the final areas of hoarding removed and the public areas below the flyover fully reinstated.
In December 2011, structural investigations revealed that steel cables on a number of the flyover's 16 spans had deteriorated significantly due to corrosion caused by water seeping into the structure.
We carried out urgent strengthening work on the worst-affected spans, and have now strengthened the remaining spans and undertaken essential planned maintenance.