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 is now complete, with strengthening to the structure fully under way.
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.
Over the past months, we have successfully replaced all the bearings which let the flyover move as the temperature varies. We now need to replace the temporary expansion joint on the flyover with a permanent one. The temporary joint was put in place while we removed the old joint during overnight closures, meaning the flyover remained open during the day.
The next phase of this work involves installing an expansion joint into the deck to complete the strengthening and refurbishment work. To do this we will need to close the flyover - either in one direction or fully - overnight and during some weekends until Thursday 20 August.
To keep disruption to a minimum, the flyover will only be fully closed overnight. However the times and days of the closures may change as the work progresses - keep checking our Hammersmith flyover travel advice page to see how the work might affect your journey.
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 now need to strengthen the remaining spans and undertake essential planned maintenance.