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Highways Agency thanks drivers for their patience

The Highways Agency has reopened the M4 in west London, after emergency repairs on an elevated section of the motorway.

They thanked drivers for their patience, while they carried out "an exceptionally delicate and difficult operation" to repair cracks in the viaduct.

The Highways Agency closed the motorway last Friday night because in entering the final stages of the repair work, a new crack was found in a highly stressed part of the bridge supports. This required a unique repair solution involving the manufacturing bespoke specialist steel plates and their installation over the crack.

The crack then had to be removed to prevent further damage to the structure. This intricate part of the operation took several hours – even though the crack was a hairline one.

The crack was discovered during an ongoing repair programme. Work on that continues and for this reason vehicles weighing 7.5 tonnes or more will still be restricted from using the motorway between the junctions. A diversion route remains in place via the A4 and A312 dual carriageways.

Drivers are thanked for their patience during this complex work.

– The Highways Agency