This final phase of strengthening the Hammersmith flyover follows on from repairs made in early 2012. 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, ensuring this vital part of the road network can continue serving London for years to come. Work to upgrade the central reservation is now complete, with strengthening to the structure now fully underway.
Hammersmith Bridge Road
Central and eastern access roads (turning into the gyratory)
Queen Caroline Street
A4 Talgarth Road
Fulham Palace Road
Bus station road
From late November until summer 2015, we will begin frequent full night time closures of the Hammersmith flyover to enable certain strengthening activities to continue. During these closures, the flyover will be closed to traffic in both directions between 22:30-05:00.
These closures will allow us to safely jack (lift) the flyover and replace the bearings. During each closure, we will be lifting 2,500 tonnes weight of the flyover and working to install new bearings. The closures are essential to carry out this work safely and quickly.
Drivers who would ordinarily use the flyover are advised to follow the signed diversion via the A40 and to take this route at the earliest opportunity in their journey.
Monitoring of network performance during previous closures of the flyover showed that at most times, drivers using the signed diversion via the A40 have experienced less delay than those travelling on the A4 Great West Road through the Hammersmith gyratory.
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.
The first of the new strengthening cables was installed in August 2014, and we are now working to install the new bearings.