M25 junction 25 improvement scheme

Closed 28 Feb 2017

Opened 16 Jan 2017

Results updated 19 Sep 2018

In January and February 2017, we held a public consultation to gather feedback on proposed plans to improve junction 25 on the M25. Information was available via our website, at public libraries and events across the area.

We presented two options for consideration:

  • Option 1 – extra lanes on roundabout and widen the A10 southbound approach
  • Option 2 – extra lanes on roundabout, widen the A10 southbound approach and M25 approaches, and provide free-flow left turn

Following an in depth analysis of all your feedback, we will now proceed with Option 2.



Have your say

We want your views about plans to improve junction 25 on the M25. Inside the consultation brochure, we’ve set out options for improvement with a budget of £25 million to £50 million.

Please tell us what you think about these plans by completing the online questionnaire.

The need for improvement at junction 25

Junction 25 is a nationally and regionally important road which connects 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. The junction itself is a 4-arm signalised roundabout with 3 lanes on each approach, connecting the eastbound and westbound M25 entry and exit roads, and the A10 northbound and southbound approaches. The circulatory carriageway on the roundabout itself varies between 2 to 4 lanes wide. During peak times, traffic on the M25 westbound exit can end up queuing back to Holmesdale Tunnel.

Our research shows that traffic in the area is expected to increase by around 20% by 2037, some of which would be generated by a significant growth in the number of new homes and jobs in Hertfordshire including Broxbourne, Enfield and the Upper Lea Valley areas. More than 7,500 vehicles per hour are predicted to travel through the roundabout at peak times. Without intervention, congestion could get worse and delays could double.

There have also been a number of traffic incidents at junction 25, which create delays and congestion along the the M25 and the A10.

If we don’t improve junction 25 by 2037, we can expect:

  • Increased congestion, 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

Details of public consultation exhibitions

You can find out more about the options by attending one of our public consultation exhibitions. Our team of experts will be on hand to answer your questions and you can view 3D visualisations of the options.

Date Location Time Address
Friday 20 January Broxbourne Borough Council Offices (Huntingdon Suite) 2:00pm to 6:00pm Bishops College
Waltham Cross
Thursday 26 January St Michaels Parish Hall 10:00am to 4:00pm Gordon Hill
Enfield EN2 0QP
Friday 3 February Enfield Ignatians Rugby Club 1:00pm to 7:00pm Donkey Lane
Enfield EN1 3PL
Saturday 4 February Enfield Ignatians Rugby Club 9:00am to 1:00pm Donkey Lane
Enfield EN1 3PL
Thursday 16 February St Georges Parish Hall 11:00am to 6:00pm 710 Hertford Road
Enfield EN3 6NR
Tuesday 21 February The Cheshunt Club 2:00pm to 9:00pm Albury Ride
Waltham Cross EN8 8XG

You can view the consultation brochure for further information.



  • All members of the public


  • Roads