M25 junction 10 project profile
This project, due for completion in spring 2026, will reduce congestion, create a smoother flow of traffic and provide safer journeys for thousands every day.
Location: A few miles north of Guildford in Surrey
Project managed by: National Highways
Status: Work in progress
About the junction
The M25 junction 10 and A3 Wisley interchange is the busiest section of the M25, with over 300,000 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?
Our project, due for completion in spring 2026, will reduce congestion, create a smoother flow of traffic and provide safer journeys for thousands every day.
We’ll also deliver environmental improvements, including the restoration of heathland around junction 10, and the planting of new trees and woodland in other areas.
The A3 will be surfaced with a low-noise material and environmental barriers along the M25 will be replaced. The effects on air quality will be minimised, and local rivers, lakes and ponds will be better protected from pollution and flooding.
Exploring the area on bicycle, foot or horse will be 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 San Domenico
- Improvements to the local environment and wildlife
- New and safer routes for cyclists, pedestrians and horse-riders
The UK’s first heathland green bridge will reconnect the commons either side of the A3, and provide a natural and safe corridor for wildlife.
