Holidaymakers warned to expect major delays on route to Gatwick and Heathrow

The closure is part of the third trench of improvements on a new bridge on the western gyratory of the roundabout at Junction 10.

The new bridge, which consists of 68 beams, each weighing 16 tonnes, and another four beams weighing 40 tonnes, will be installed as part of ongoing work to make journeys safer and reduce pollution.

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The closure will affect drivers and holidaymakers on the route toThorpe Park, Legoland and Gatwick and Heathrow airports.

The improvements follow on from previous work conducted during the May closure which saw work carried out on the eastern gyratory.

Jonathan Wade, senior project manager at National Highways, said: “The previous two closures have gone well with significant progress being made during both.

“We would urge all drivers to follow the official diversion route as this is the best chance of reaching your destination in good time. Please ignore your satnavs and follow our diversion route instead.”

This is the latest planned closure on the M25 this year, with a further two due later this year.

To minimise disruptions to drivers, National Highways has put a set of diversions in place along the M25.

For drivers passing through junction 10 and Junction 11: they sould exit the M25 at J10 and take the third exit to north bound A3 to the A245 Painshill Junction.

While on the A245 drivers should head to Woking, and Byfleet, then at the Six Crossroads Roundabout take the fifth exit to the A320 continuing to M25 Junction 11 where the diversion will end.

Between junction 11 and junction 10 drivers should exit the M25 at J11 and take the third exit to the A320 south towards Woking.

Then at the Six Crossroads Roundabout take the A245 towards Byfleet and continue on the A245 to the A3 Painshill junction.

From here drivers should then take the third exit to the southbound A3 to junction 10 where the diversion will end.

As part of the work, drivers are being urged to plan their trips in advance to ensure they are not left stuck in hours worth of traffic to try and reach their destination.

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RAC Breakdown spokesperson Alice Simpson added: “Drivers should follow the signed diversion routes which have been designed to keep traffic flowing as much as possible.

“It’s worth remembering that the closure coincides with the finals at Wimbledon, so anyone planning on driving to this should anticipate a far longer journey or look at whether there’s a viable public transport alternative.”