M25 junction 25 improvements

Upgrade of junction 25 on the M25 to provide greater capacity.

Start date 2020-21
End date TBC
Cost £25 million to £50 million

Latest updates

  • 03 August 2021

    Overnight closure: 3 August 2021

    In August, we will be continuing our improvement works on the A10 north of the junction and carrying out some work on the roundabout at junction 25.

    With road users in mind, we will be installing narrow lanes on the A10 to keep traffic moving, instead of reducing the number of lanes. These lanes are essential for the safety of our staff and the general public whilst we carry out the next phase of construction.

    In order to carry out this work, we will need to have closures in place. Details of these closures are listed below:

    A10 southbound lane closures and partial roundabout closure – 10pm Tuesday 3 August to 5am Wednesday 4 August

    • Two lanes will be closed on the A10 southbound, north of the junction between Winston Churchill Way and the junction 25 roundabout.
    • A section of the junction 25 roundabout will also be closed, this means:
      • If you are joining the junction from the M25 clockwise, you can still access the A10 northbound as usual, but you will need to follow the diversion to access the A10 southbound.
      • If you join from the A10 north of the junction, you can only access the M25 clockwise, for all other routes, please follow the diversion.
      • You will be able to join the junction from the M25 anticlockwise and access the A10 southbound and northbound.
      • You can also access the junction from the A10 south of the junction and access the M25 anticlockwise, the A10 northbound and the M25 clockwise as usual.  

    The diversion route is shown on the map below, and takes you from the A10 north of the junction via Churchill Way and Monarchs Way to the A1010. Follow the A1010, until you reach to Carterhatch Lane, take a right and this road will bring you back to the A10 south of the M25. Join the A10 northbound to access the M25.

  • 07 July 2021

    Construction update and planned closures: July 2021

    Construction update:

    In July, we’ll be continuing our work on the parapets and to install cables around the junction. Parapets act as a safety barrier and are often installed at the edge of bridges, motorways or retaining walls to provide protection for vehicles and pedestrians from the vertical drop.

    We’ll also be carrying out some resurfacing works on the A10 southbound approach to the junction.

    Overnight closures: July 2021 

    Details of overnight road closures for July are listed below. Please plan ahead and follow signed diversion routes.

    M25 junction 25 roundabout closures:

    • The eastern section of the roundabout at junction 25 will be closed between 10pm Saturday 17 July and 5am Sunday 18 July.

    During these closures, we will have some temporary traffic management in place:

    • A diversion route will be in place for vehicles wanting to join the A10 southbound from the M25 clockwise or from the A10 north of the junction.
    • You will still be able to join the A10 southbound or northbound from the M25 anticlockwise as usual.
    • If approaching from the A10 north of the junction, you will also be able to join the M25 clockwise, but you will need to follow the diversion to join the M25 anticlockwise.

    The diversion route is shown on the map below, and takes you from the A10 north of the junction via Churchill Way and Monarchs Way to the A1010. Follow the A1010, until you reach to Carterhatch Lane, take a right and this road will bring you back to the A10 south of the M25. Join the A10 northbound to access the M25.

    M25 junction 25 anticlockwise exit slip closures:

    • The M25 junction 25 anticlockwise exit slip will be closed between 10pm Saturday 17 July and 5am Sunday 18 July

    A signed diversion route will be in place that takes you to junction 24, where you leave via the anticlockwise exit slip and re-join the M25 clockwise using the junction 24 clockwise entry slip. By following the carriageway back to junction 25, you can access the junction using the clockwise exit slip.

    A10 southbound approach closures

    • Full weekend closure of the A10 southbound between the traffic lights adjacent to Big Motoring World, and junction 25 from 9pm Friday 23 July til 5am Monday 26 July.

    Businesses located at the traffic lights will still have access throughout the closure, and you will still be able access the junction from the M25 anticlockwise.  

    The diversion route is shown on the map below for traffic heading southbound towards the junction from the A10. From the A10 north of the junction follow Churchill Way and Monarchs Way to the A1010. Stay on the A1010, until you reach to Carterhatch Lane, take a right and this road will bring you back to the A10 south of the M25. Join the A10 northbound to access the M25.

    Please see site notices and social media posts for up to date information.

    Please note, the written description alongside the maps is automatically generated by google and may not be as helpful or accurate as our written descriptions included here.

  • 02 June 2021

    Overnight closures: June 2021

    Our work to install new ducting and lighting will continue throughout June. To keep everyone safe, we will need to put in place some overnight road closures. These are listed below, along with diversion routes. Some of these are longer than our usual overnight closures, so please ensure you plan ahead. 

    M25 junction 25 anticlockwise exit slip closures:

    • The M25 junction 25 anticlockwise exit slip will be closed between 9pm Saturday 5 June and 6am Sunday 6 June and from 9pm Sunday 6 June and 5.30am Monday 7 June. Then again between 9pm Saturday 19 June and 6am Sunday 20 June.

    A signed diversion route will be in place that takes you to junction 24, where you leave via the anticlockwise exit slip and re-join the M25 clockwise using the junction 24 clockwise entry slip. By following the carriageway back to junction 25, you can access the junction using the clockwise exit slip.

    Junction 25 roundabout closures:

    • The eastern section of the roundabout at junction 25 will be closed between 9pm Saturday 5 June and 6am Sunday 6 June and from 9pm Sunday 6 June and 5.30am Monday 7 June. Then again between 9pm Saturday 19 June and 6am Sunday 20 June.

    During these closures, we will have some temporary traffic management in place:

    • A diversion route will be in place for vehicles wanting to join the A10 southbound from the M25 clockwise or from the A10 north of the junction.
    • You will still be able to join the A10 southbound or northbound from the M25 anticlockwise as usual.
    • If approaching from the A10 north of the junction, you will also be able to join the M25 clockwise, but you will need to follow the diversion to join the M25 anticlockwise.

    The diversion route is shown on the map below, and takes you from the A10 north of the junction via Churchill Way and Monarchs Way (A1010) to join the A10 south of the M25.

     

  • 17 May 2021

    Overnight closures: 22 to 23 May 2021

    Our work to upgrade street lighting and ducting is progressing well. Over the weekend of 22 and 23 May, we will be working on the roundabout at junction 25. To ensure everyone’s safety, we will need to close part of the roundabout. This means that from 9pm Saturday 22 May til 5.30am on the morning of Sunday 23 May, and again from 9pm Sunday 23 May til 5am on the morning of Monday 24 May, we will have some temporary traffic management in place:

    • A diversion route will be in place for vehicles wanting to join the A10 southbound from the M25 clockwise or from the A10 north of the junction.
    • You will still be able to join the A10 southbound or northbound from the M25 anticlockwise as usual.
    • If approaching from the A10 north of the junction, you will also be able to join the M25 clockwise, but you will need to follow the diversion to join the M25 anticlockwise.

    The diversion route is shown on the map below, and takes you from the A10 north of the junction via Churchill Way and Monarchs Way (A1010) to join the A10 south of the M25.

    Thank you for your understanding and patience as we work to upgrade the junction.

     

  • 21 January 2021

    Virtual public information event – how to join

    Due to the pandemic and lockdown, we're hosting an online virtual public information event, where you'll be able to view detailed information about the scheme, and ask our project team questions.

    Our team will be available on the following dates:

    Monday 25 January: 8am – 12pm and 2pm – 6pm

    Friday 29 January: 11am – 3pm

    Saturday 30 January: 9am – 12pm

    The link to the virtual room will appear here at 8am on Monday 25 January.

    Join the virtual event

     

    Project now under way

    We’ve begun preparation works by starting to install our site compound and are building an access track for construction vehicles, with the main construction works to begin in February.

    To keep up-to-date with the scheme progress, please sign up for updates on the right hand side of this page.

  • 21 December 2020

    Enabling and construction work to begin early next year

    We’ve been busy working on developing the design and construction plan since our last public information event in June 2019 and the feedback has helped shape our approach to delivering the scheme. 

    We’re preparing to start work in January 2021 and the main construction work is due to begin in February. In January we will work on moving a mains water pipe and phone lines, which needs to be done before the main work can start. Once the main construction work starts, you will notice traffic management on and around the junction which may impact on your journeys, so please take this into consideration if you’ll be using the roads in the area.

    Email updates on progression during scheme construction will then be sent to all those who have registered to receive project updates with the scheme webpage.

  • 24 January 2020

    Detailed design process

    We'll now progress with the detailed design of this scheme through the course of 2020. Scheme construction will then begin in winter 2020-21. Email updates on progression during scheme construction will then be sent to all those who have registered to receive project updates with the scheme webpage.

  • 25 June 2019

    End of Public Information Exhibition period

    The Public Information Exhibition period closed on 24 June 2019.

    The Public Information Exhibition was announced from 20 May 2019 onwards following on from the previous communication milestones. The purpose of the PIEs was to:

    • inform stakeholders of the progress we had made since the PRA
    • describe what would happen next
    • share our initial understanding of potential traffic impacts during construction
    • provide further opportunity to meet the team and ask any questions

    The majority of feedback was regarding the following themes/topics

    • Construction: when the work will start, finish and its duration
    • Discounted options/design decisions
    • How the scheme will operate

Project information

Overview

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

Documents

Traffic information

Information about scheduled roadworks and events on our motorways and major roads.

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