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

  • 04 March 2021

    Main construction work under way

    The main construction work for the M25 junction 25 improvement scheme is now underway, with site clearance work and the installation of narrow lanes already taking place.

    Barriers will need to be put in place for us to install more narrow lanes, which are there to allow us to start work on widening the slip road as well as protect the workforce and public.

    For us to install the barriers we will need to have closures in place, details of which are listed below:

    • Closure of the M25 eastbound off slip between 10pm Monday 8 March, and 5am on Tuesday 9 March
    • Closure of the M25 eastbound off slip and western side of the junction leading to and including the A10 northbound between 10pm Tuesday 9 March and 5am Wednesday 10 March
    • Depending on progress and the weather, the above closure may also be required between 10pm Wednesday 10 March to 5am Thursday 11 March

    On site notices and social media posts will provide the most up to date information in relation to the closure possibly being needed on the night of Wednesday 10 March.

    Diversion routes

    Eastbound off slip closure

    Eastbound offslip closure and A10 northbound closure

    A10 northbound closure

  • 26 February 2021

    Main construction work to start

    The main construction work for the M25 junction 25 improvement scheme begins on Monday 1 March, with the widening of the westbound off slip, eastbound off slip and works to both the A10 northbound and on the junction itself set to start.

    Barriers will start being put in place along the westbound off slip in order for us to install narrow lanes, which are there to allow us to start work on widening the slip road as well as protect the workforce and public.

    For us to install the barriers, we will need to have a closure of the westbound off slip in place between 10pm and 5am each night from Monday 1 March until Wednesday 3 March. The diversion route map for this closure can be found below.

  • 17 February 2021

    Road closures and diversions for narrow lanes installation

    To help reduce the impact on our customers and keep disruption and road closures to a minimum during our M25 junction 25 improvement works, we’re working together with nearby contractors to share each other’s traffic management.

    In order to install the narrow lanes needed for the M25 junction 25 improvement scheme, we will need to put some closures in place, which are detailed below:

    • closure of the M25 eastbound off slip and closure of the M25 eastbound on slip between 10pm and 5am on Monday 22 February
    • closure of the M25 westbound off slip between 10pm and 5am each night from Monday 1 March to Wednesday 3 March
    • closure of the M25 eastbound off slip on Monday 8 March between 10pm and 5am
    • closure of the M25 eastbound off slip and western side of the junction leading to the A10 northbound on Tuesday 9 March between 10pm and 5am. Dependant on progress and the weather, we may also need to install this closure on Wednesday 10 March between 10pm and 5am and on site notices and social media posts will provide the most up to date information.
    Diversion routes

    All the diversion routes for these closures will be clearly signed on the network and are listed below:

    Monday 22 February Diversion

    • For drivers wanting to exit the M25 via the junction 25 eastbound off slip, continue eastbound along the M25 and take the junction 26 off slip. Take the third right at the roundabout on to Honey Lane, follow and then take the third exit at the roundabout on to the junction 26 westbound on slip. Continue along the M25 westbound, take the junction 25 off slip and continue journey.

    • For drivers wanting to enter the M25 junction 25 via the eastbound on slip, take the M25 junction 25 westbound on slip, continue along the M25 westbound and take the junction 24 off slip. Take the fifth exit at the roundabout, enter the M25 via the junction 24 eastbound on slip and continue journey.

    Monday 1 March to Wednesday 3 March Diversion

    • For drivers wanting to exit the M25 via the junction 25 westbound off slip, continue westbound along the M25 and take the junction 24 off slip. Take the fifth exit at the roundabout, enter the M25 via the junction 24 eastbound on slip and continue eastbound. Take the junction 25 off slip and continue journey.

    Monday 8 March Diversion

    • For drivers wanting to exit the M25 via the junction 25 eastbound off slip, continue eastbound along the M25 and take the junction 26 off slip. Take the third right at the roundabout on to Honey Lane, follow and then take the third exit at the roundabout on to the junction 26 westbound on slip. Continue along the M25 westbound, take the junction 25 off slip and continue journey.

    Tuesday 9 March and Wednesday 10 March (Contingency Night) Diversion

    • For drivers wanting to exit the M25 via the junction 25 eastbound off slip, continue eastbound along the M25 and take the junction 26 off slip. Take the third right at the roundabout on to Honey Lane, follow and then take the third exit at the roundabout on to the junction 26 westbound on slip. Continue along the M25 westbound and take the junction 25 off slip.

    • For drivers wanting to join the A10 northbound, take the A10 / Great Cambridge Road southbound into Enfield and then turn left on to the A1055 / Bullsmoor Lane. Turn left on to the A1010 / Hertford Road and then take the second right at the roundabout on to Monarchs Way. At the next roundabout take the second exit to continue along Monarchs Way and at the next roundabout take the second exit on to A121 / Winston Churchill Way. Continue to follow the road up to the A10 / A121 Winston Churchill Way roundabout and continue journey.

     

  • 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

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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