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

  • 23 September 2021

    Changed date for our last September weekend closure

    We’ve changed the date of our closure this weekend and will now be closing the western side of the roundabout for one night only from Friday 24 September until Saturday 25 September

    • The western side of the roundabout will be closed between the M25 anticlockwise exit and the approach from the M25 clockwise. The closure will start from 10pm Friday 24 September to 6am Saturday 25 September. Please note the date and time of this closure is different to what we previously announced, but everything else is the same.

    If you are approaching the junction from the A10 north of the junction, you will still be able to access all exits of the roundabout other than the A10 northbound.

    If you approach the junction from the M25 clockwise, you will be able to access all exits of the roundabout. If approaching from the M25 anticlockwise, you will be able to access the A10 southbound towards Enfield, but you will not be able to access the A10 northbound and will need to follow our local diversion or use the motorway to turn around at junction 24 and access from the clockwise exit slip road at junction 25.

    The local diversion route is shown on the map below and takes you down onto the A10 southbound, taking a left onto Carterhatch Lane, turn left onto the A1010 and then turn left at Mocharchs Way, onto Winston Churchill way, where you can use the roundabout to access the A10 north of the M25.

  • 02 September 2021

    Construction update and planned closures: September 2021

    In September, we will be continuing our improvements on the Holmesdale tunnel exit slip approaching the junction. We will also be carrying out some work on the new dedicated exit from the M25 clockwise to A10 northbound.

    To help us carry out this work safely, we will need to have road closures in place. Details of our next closure are below:

    Closure of M25 clockwise exit slip road - 11 September and 12 September

    • The M25 junction 25 clockwise exit slip road will be closed from 10pm to 5am on Saturday 11 September and Sunday 12 September.

    The diversion route is shown on the map below and takes you to junction 26 where you can turn around and access the junction from the clockwise exit slip.

    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.

    Closure of M25 anticlockwise exit slip road - 15 September and 16 September 

    • The M25 junction 25 anticlockwise exit slip road will be closed 10pm to 5am on Wednesday 15 September and Thursday 16 September.

    The diversion route is shown on the map below and takes you to junction 24 where you can turn around and access the junction from the clockwise exit slip.

    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.

    Closure on the western side of the roundabout – 17 September to 20 September and 24 September to 27 September

    • The western side of the roundabout will be closed between the M25 anticlockwise exit and the approach from the M25 clockwise. The closure will start from 9pm Friday 17 September til 5am Monday 20 September and again from 9pm Friday 24 September to 5am Monday 27 September.

    If you are approaching the junction from the A10 north of the junction, you will still be able to access all exits of the roundabout other than the A10 northbound.

    If you approach the junction from the M25 clockwise, you will be able to access all exits of the roundabout. If approaching from the M25 anticlockwise, you will be able to access the A10 southbound towards Enfield, but you will not be able to access the A10 northbound and will need to follow our local diversion or use the motorway to turn around at junction 24 and access from the clockwise exit slip road at junction 25.

    The local diversion route is shown on the map below and takes you down onto the A10 southbound, taking a left onto Carterhatch Lane, turn left onto the A1010 and then turn left at Mocharchs Way, onto Winston Churchill way, where you can use the roundabout to access the A10 north of the M25.

    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.

    You can find out more details of other closures and work on our network on our daily closures page. 

  • 04 August 2021

    Construction update and planned closures: 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 approach closures – w/c 9 August

    We’ll be closing the A10 southbound north of the junction, between Winston Churchill Way and the junction 25 roundabout, as follows:

    • From 10pm Tuesday 10 August, reopening by 5am Wednesday 11 August
    • From 10pm Friday 13 August, reopening by 5am Monday 16 August

    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.

    On site notices and social media posts will provide the most 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.

  • 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.

  • 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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