The M25 is set to close this weekend amid £317m improvement works as engineers install a new bridge at Junction 10 as part of the scheme in Wisley.

A detailed diversion route has been mapped around the closure, with detailed turn-by-turn directions that drivers should follow.

National Highways confirmed in June that the M25 would shut in both directions for a five-mile stretch between Wisley at Junction 10 and Chertsey at Junction 11 and the closure will begin at 9pm on Friday, 12 July and end at 6am on Monday 15 July, says MyLondon.

Motorists have been urged to avoid the area – as in previous closures – to help minimise the impact of traffic on local roads along the diversion route. The closure is near to Byfleet, West Byfleet, Sheerwater, and Ottershaw.

The full weekend closure is needed to allow engineers to build a bridge on the western gyratory of the roundabout at Junction 10. Identical work on the eastern gyratory was completed during an earlier closure in May.

National Highways has shared a map of the recommended diversion route that should be taken in both the clockwise and anticlockwise directions. This can be viewed below, along with a turn-by-turn breakdown of directions.

Diversion routes

Clockwise – Junction 10 to 11

• Exit the M25 at J10
• Take the third exit for the A3 northbound to the A245 Painshill Junction
• Follow the A245 towards Woking and Byfleet
• Take the fifth exit at the Six Crossroads Roundabout to the A320
• Continue to the M25 Junction 11 where the diversion will end.

Anticlockwise – Junction 11 to 10

• Exit the M25 at J11
• Take the third exit to the A320 south towards Woking
• Take the A245 at the Six Crossroads Roundabout towards Byfleet
• Continue on the A245 to the A3 Painshill Junction
• Take the third exit to the southbound A3 to Junction 10 on the M25 where the diversion will end.

People who live locally or who plan to travel through the area between Gatwick and Heathrow airports or for sports and other events should leave extra time for their journeys or make alternative arrangements. People should expect delays and only travel if necessary.

The new bridge will have 68 beams, each weighing 16 tonnes, and a further four beams weighing 40 tonnes. National Highways senior project manager Jonathan Wade earlier outlined: “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.”