M25 junction 10 project profile
This project, which completed in spring 2026, has reduced congestion, created a smoother flow of traffic and now provides safer journeys for thousands of motorists every day.
Location: A few miles north of Guildford in Surrey
Project managed by: National Highways
Status: Completed
About the junction
The M25 junction 10 and A3 Wisley interchange is the busiest section of the M25, with over 270,000 vehicles travelling through it every day. Journeys that include commuters, businesses, those visiting local attractions and holiday makers.
This sheer volume of traffic means vehicles often start queuing northbound between Ockham Park roundabout and the M25 junction 10, on the junction 10 roundabout, and on the approach to the Painshill roundabout.
The junction is located among some rare and beautiful habitats including the heathland at Wisley and Ockham commons.
What is the project?
The project, completed in spring 2026, aimed to reduce congestion, create a smoother flow of traffic and provide safer journeys for thousands every day.
We also delivered environmental improvements, including the restoration of heathland around junction 10, and the planting of new trees and woodland in other areas.
The A3 has been surfaced with a low-noise material and environmental barriers along the M25 have been replaced. The effects on air quality have been minimised by creating freer flowing conditions, and local rivers, lakes and ponds have been better protected from pollution and flooding.
Exploring the area on bicycle, foot or horse is now easier, with new bridges crossing the A3 and M25, connecting the four quadrants surrounding junction 10 for the first time.
Key features of the scheme:
- An additional lane on the A3 in both directions from Ockham and Painshill junctions towards the M25
- A larger roundabout with extra lanes to increase capacity
- Free-flow left turns at all four corners of the junction
- Improvements to the A245 Seven Hills junction and Painshill roundabout
- Safer access to Old Lane, Elm Lane, Heyswood campsite and Surrey Wildlife Trust
- Improvements to the local environment and wildlife
- New and safer routes for cyclists, pedestrians and horse-riders
