M25 junction 25 improvements
Upgrade of junction 25 on the M25 to provide greater capacity.
Junction 25 is a nationally and regionally important road, connecting the M25 with the A10. Up to 6,300 vehicles per hour currently travel through the junction 25 roundabout at peak times, causing congestion and regular delays. The A10 southbound approach into the junction is also a congestion hotspot in Broxbourne.
Our research shows that if we don’t improve junction 25 by 2037, we can expect:
- increased congestion and lengthy queues and journey times could double
- average speeds could reduce by up to 30% through the junction
- disruption would be more widespread following incidents
- congestion would constrain future development and growth opportunities
- uncontrolled deterioration to local air quality
Detailed information about the scheme was presented at our virtual engagement event held in early 2021.
Through this scheme, we aim to:
- reduce congestion and delays at junction 25 between the M25 and the A10
- increase capacity by widening both the roundabout and the A10 southbound approach
- redesign the roundabout to improve safety and traffic flow
- support future traffic demands, enabling development and economic growth
- maintain access for pedestrians and cyclists and improve conditions where possible
- minimise the environmental effects of this scheme on local air quality and noise