M25 junction 23

Improving junction 23 of the M25 by increasing capacity.

Start date August 2019
End date August 2020
Cost £7.5 million

Latest updates

  • 26 May 2020

    Works at Bignells Corner gets under way

    We’re bringing our planned works at Bignells Corner forward and will be carrying out some of these shifts between 8am and 5pm until June. To allow us to undertake these works safely, the full closure of the outbound dual carriageway to the junction 23 circulatory will be required. At least one traffic lane will be re-opened at the end of each shift. Lanes may remain closed outside of working hours for the safety of road users.

    Traffic counts will be undertaken daily and should traffic levels start to increase towards normal levels, works will be reverted to overnight shifts.

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    Cornavirus (Covid-19)

    Our current priority is to play our part in keeping the country safe, whilst supporting the movement of essential supplies, services and people who cannot work from home. We are following the government’s policy, which advises that construction activity should continue where it can be done safely. All our sites have strict safeguarding measures, in line with Public Health England guidance, to prevent the spread of Covid-19 and protect workers and the public.

  • 12 May 2020

    Work completed so far

    Works completed or underway since the start of the scheme in August 2019.

    A1 southbound nearside:

    • Sheet piled retaining wall has been completed
    • Drainage works have been completed
    • Ductwork for new lighting has been installed
    • Surface water channel has been completed
    • Pavement works are currently underway

    A1 southbound offside:

    Vegetation clearance has been completed

    Gyratory opposite M25 anti-clockwise exit slip road:

    • Drainage has been completed
    • Ductwork for signals has been completed
    • Works are currently underway on new signage and landscaping

    M25 anti-clockwise exit slip road:

    • Sheet piled retaining wall and reinforced concrete capping beam have been completed
    • Drainage has been completed
    • Street lighting and traffic signal ducting has been completed
    • Pavement construction is currently underway

    Bignells Corner:

    • Site clearance has been completed
    • Temporary street lighting has been installed
    • Earthworks for pavement on nearside and offside is currently underway

  • 13 December 2019

    Start of works

    Works started in August 2019. Piling work has been completed at the A1 southbound entry slip road and the M25 anti-clockwise exit slip road.

Project information

Overview

Work will see widening of the A1 southbound merge slip road to provide a two-lane entry to the A1 south and a new footway for pedestrians from the BP service station to the existing footway adjacent to the roundabout. 

The scheme incudes an upgrade to the traffic signal timings to improve traffic flow through the junction. There will be a new lane at the Bignells Corner exit from South Mimms services with widening of the M25 westbound exit slip road to accommodate an additional lane on the approach to the junction to reduce congestion. 

The M25 junction 23 is controlled by traffic signals, and is where the M25, A1, A1(M) and A1081 meet. Junction 23 is operating over its design capacity, which leads to congestion, queuing traffic and journey delays during peak hours. The junction 23 scheme also provides for safety improvements within its design as well as a more free-flowing network with reduced congestion and more reliable journey times. 

Documents

Traffic information

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

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