March 11 2014 Latest news:
Monday, July 9, 2012
The motorway, which is the main link between Heathrow Airport and the capital city, has been shut between junctions 1 and 3 since Friday.
Closures in both directions remain in place between junctions 2 and 3.
Officials are desperate to fix a crack in a highly-stressed zone over bridge supports.
Olympic grandees and VIPs from around the world due to descend upon London for the Games, in under three weeks.
Thousands of commuter journeys in to London have been plunged into chaos by efforts to fix quickly the problem.
Diversions are in place on the adjacent dual carriageways, the A312 and the A4.
London Mayor Boris Johnson has urged the works to be finished as quickly as possible.
A Highways Agency spokesman said: “We expect the ongoing programme of repairs will be completed to enable the viaduct to operate in its full capacity in time for the London 2012 Olympic Games later this month.