M25 junction 23

The project aims to increase capacity at junction 23 of the M25.

Region:  South East
Start date:  August 2019
Cost:  £7.5 million
Status:  CURRENT
Type:  Improvement Scheme
End date:  August 2020
Programme:  

Progress report

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

What's next?

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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Covid-19

Highways England’s current priority is to play its 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.

Timeline

Event Date
Complete detailed design February 2019
Start of construction works August 2019
Planned completion of the works December 2020

Why we need this scheme

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.

Aims

Proposed improvements

  • Widening of the A1 southbound merge slip road to provide a two-lane entry to the A1 south
  • New footway for pedestrians from the BP service station to the existing footway adjacent to the roundabout
  • Upgrade the traffic signal timings to improve traffic flow through the junction
  • A new lane at the Bignells Corner exit from South Mimms services
  • Widening of the M25 westbound exit slip road to accommodate an additional lane on the approach to the junction to reduce congestion
  • Updated road signs to reflect the new road layout

Benefits

  • Safer network – reduced accident rates, improved signs and road markings to encourage good lane discipline, improved provision for pedestrians and cyclists
  • More free-flowing network – reduced congestion and more reliable journey times

Environmental impact

The scheme is expected to have only minor environmental impacts:

  • The scheme is adjacent to the northerly boundary of The Mimms Caravan Park and hotels within South Mimms Services. There will be some construction activities that will cause noise and vibration. There will be measures in place to reduce impacts as far as is possible. Where possible the noisiest activities will be programmed during the day.
  • The works will be over part of Clarehall Brook and the scheme includes realignment of the surface water drainage system. The new drainage design is subject to the approval of the Environment Agency.
  • The drainage realignment entails rerouting one the existing outfall points into the Clarehall Brook to a new upstream discharge point. The outfall design is being done in conjunction with the Environment Agency to ensure that it integrates into the landscape as well providing the required hydraulic performance.
  • The site is assessed as suitable for great crested newts and common species of reptile. Any suitable habitat within the working areas will be dismantled by hand and an Ecologist will be on site when required during the works.
  • Deciduous woodlands and hedgerow habitat present within the site will be excluded from the works area, delineated by Heras fencing and avoided during the works.
  • An otter ramp within the roundabout will be protected from the works.

Project media files and documents

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Project timeline

Planned roadworks

Roadworks and Events for England

The latest incident information for England's motorway and trunk routes provided by Highways England

Location : The M25 clockwise between junctions J23 and J24 . Lane Closures : Lane one is closed. Reason : Road repairs. Status : Currently Active. Period : expect disruption until 05:30 on 1 September 2020. Lanes Closed : There is one of four lanes closed.
Posted: August 8, 2020, 9:40 am
Location : The M25 clockwise entry slip at junction J25 . Lane Closures : Lane one will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : Expect disruption everyday between 22:00 and 05:30 from 10 August 2020 to 13 August 2020. Lanes Closed : All lanes will be closed.
Posted: August 8, 2020, 5:07 am
Location : The M1 northbound between junctions J1 and J4 . Lane Closures : Lanes 1 and 2 will be closed. Reason : Emergency barrier repairs are planned. Status : Pending. Schedule : From 22:00 on 10 August 2020 to 05:00 on 11 August 2020. Lanes Closed : There will be two of three lanes closed.
Posted: August 8, 2020, 4:01 am
Location : The M25 clockwise entry slip at junction J23 . Lane Closures : The hard shoulder and lane 1 are closed. Reason : Road repairs. Status : Currently Active. Period : expect disruption until 05:30 on 1 September 2020. Lanes Closed : There is one of two lanes closed.
Posted: August 7, 2020, 10:58 pm
Location : The M25 anticlockwise entry slip at junction J19 . Reason : Roadworks are planned. Status : Pending. Schedule : From 23:00 on 14 August 2020 to 05:00 on 15 August 2020.
Posted: August 7, 2020, 10:10 pm
Location : The M25 anticlockwise entry slip at junction J23 . Reason : Roadworks are planned. Status : Pending. Schedule : From 22:00 on 13 August 2020 to 05:00 on 14 August 2020. Lanes Closed : All lanes will be closed.
Posted: August 7, 2020, 1:10 pm
Location : The M25 anticlockwise at junction J23 . Lane Closures : Lane one will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : From 22:00 on 13 August 2020 to 05:00 on 14 August 2020. Lanes Closed : There will be one of three lanes closed.
Posted: August 7, 2020, 1:10 pm
Location : The M25 anticlockwise between junctions J23 and J22 . Lane Closures : Lane one will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : From 22:00 on 13 August 2020 to 05:00 on 14 August 2020. Lanes Closed : There will be one of four lanes closed.
Posted: August 7, 2020, 1:10 pm
Location : The M25 anticlockwise exit slip at junction J20 . Reason : Roadworks are planned. Status : Pending. Schedule : From 22:00 on 13 August 2020 to 05:30 on 14 August 2020. Schedule : From 23:00 on 14 August 2020 to 06:00 on 15 August 2020. Lanes Closed : All lanes will be closed.
Posted: August 6, 2020, 9:10 pm
Location : The M1 southbound between junctions J5 and J1 . Lane Closures : Lane one will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : From 22:00 on 13 August 2020 to 05:00 on 14 August 2020. Lanes Closed : There will be one of three lanes closed.
Posted: August 6, 2020, 9:10 pm
Location : The M1 southbound between junctions J5 and J1 . Lane Closures : Lane one will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : From 22:00 on 13 August 2020 to 05:00 on 14 August 2020. Lanes Closed : There will be one of four lanes closed.
Posted: August 6, 2020, 9:10 pm
Location : The M1 southbound between junctions J5 and J1 . Lane Closures : Lane one will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : From 22:00 on 13 August 2020 to 05:00 on 14 August 2020. Lanes Closed : There will be one of three lanes closed.
Posted: August 6, 2020, 9:10 pm
Location : The M25 anticlockwise at junction J23 . Lane Closures : Lane one will be closed. Reason : Road repairs are planned. Status : Pending. Schedule : Expect disruption everyday between 22:00 and 05:30 from 12 August 2020 to 14 August 2020. Schedule : From 23:00 on 14 August 2020 to 06:00 on 15 August 2020. Schedule : From 22:00 on 15 August 2020 to 06:00 on 16 August 2020. Schedule : From 22:30 on 16 August 2020 to 05:30 on 17 August 2020. Lanes Closed : There will be one of three lanes closed.
Posted: August 5, 2020, 9:10 pm
Location : The M25 anticlockwise between junctions J24 and J23 . Lane Closures : Lane one will be closed. Reason : Road repairs are planned. Status : Pending. Schedule : Expect disruption everyday between 22:00 and 05:30 from 12 August 2020 to 14 August 2020. Schedule : From 23:00 on 14 August 2020 to 06:00 on 15 August 2020. Schedule : From 22:00 on 15 August 2020 to 06:00 on 16 August 2020. Schedule : From 22:30 on 16 August 2020 to 05:30 on 17 August 2020. Lanes Closed : There will be one of four lanes closed.
Posted: August 5, 2020, 9:10 pm
Location : The M1 northbound between junctions J1 and J4 . Lane Closures : Lane one will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : From 22:00 on 12 August 2020 to 05:00 on 13 August 2020. Lanes Closed : There will be one of three lanes closed.
Posted: August 5, 2020, 9:10 pm
Location : The M25 anticlockwise between junctions J25 and J24 . Lane Closures : Lanes 1 and 2 will be closed. Reason : Roadside equipment maintenance is planned. Status : Pending. Schedule : From 22:00 on 12 August 2020 to 05:00 on 13 August 2020. Lanes Closed : There will be two of four lanes closed.
Posted: August 5, 2020, 9:10 pm
Location : The M25 anticlockwise exit slip at junction J23 . Lane Closures : Lane one will be closed. Reason : Road repairs are planned. Status : Pending. Schedule : Expect disruption everyday between 22:00 and 05:30 from 12 August 2020 to 14 August 2020. Schedule : From 23:00 on 14 August 2020 to 06:00 on 15 August 2020. Schedule : From 22:00 on 15 August 2020 to 06:00 on 16 August 2020. Schedule : From 22:30 on 16 August 2020 to 05:30 on 17 August 2020. Lanes Closed : There will be one of two lanes closed.
Posted: August 5, 2020, 9:10 pm
Location : The A1 southbound entry slip from the M25 . Reason : Road repairs are planned. Status : Pending. Schedule : Expect disruption everyday between 22:00 and 05:30 from 12 August 2020 to 14 August 2020. Schedule : From 23:00 on 14 August 2020 to 06:00 on 15 August 2020. Schedule : From 22:00 on 15 August 2020 to 06:00 on 16 August 2020. Schedule : From 22:30 on 16 August 2020 to 05:30 on 17 August 2020. Lanes Closed : All lanes will be closed.
Posted: August 5, 2020, 9:10 pm
Location : The M1 southbound between junctions J4 and J1 . Lane Closures : Lane one will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : From 22:00 on 12 August 2020 to 05:00 on 13 August 2020. Lanes Closed : There will be one of three lanes closed.
Posted: August 5, 2020, 9:10 pm
Location : The M25 anticlockwise between junctions J21 and J20 . Lane Closures : Lanes 1 and 2 will be closed. Reason : Emergency roadside drains works are planned. Status : Pending. Schedule : From 22:00 on 8 August 2020 to 05:00 on 9 August 2020. Lanes Closed : There will be two of four lanes closed.
Posted: August 5, 2020, 1:42 pm
Location : The M25 anticlockwise at junction J20 . Lane Closures : Lanes 1 and 2 will be closed. Reason : Emergency roadside drains works are planned. Status : Pending. Schedule : From 22:00 on 8 August 2020 to 05:00 on 9 August 2020. Lanes Closed : There will be two of three lanes closed.
Posted: August 5, 2020, 1:42 pm
Location : The M25 anticlockwise exit slip at junction J20 . Reason : Emergency roadside drains works are planned. Status : Pending. Schedule : From 22:00 on 8 August 2020 to 05:00 on 9 August 2020. Lanes Closed : All lanes will be closed.
Posted: August 5, 2020, 1:42 pm
Location : The M25 anticlockwise between junctions J27 and J25 . Lane Closures : Lanes 1, 2 and 3 will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : Expect disruption everyday between 22:00 and 05:00 from 10 August 2020 to 14 August 2020. Schedule : From 23:00 on 14 August 2020 to 05:00 on 15 August 2020. Lanes Closed : All lanes will be closed.
Posted: August 5, 2020, 1:12 pm
Location : The M25 anticlockwise between junctions J20 and J18 . Lane Closures : Lanes 2, 3 and 4 will be closed. Reason : Emergency roadworks are planned. Status : Pending. Schedule : From 22:00 on 11 August 2020 to 05:00 on 12 August 2020. Lanes Closed : There will be three of four lanes closed.
Posted: August 4, 2020, 9:12 pm
Location : The M1 northbound entry slip at junction J2 . Reason : Roadworks are planned. Status : Pending. Schedule : From 22:00 on 11 August 2020 to 05:00 on 12 August 2020. Lanes Closed : All lanes will be closed.
Posted: August 4, 2020, 9:12 pm
Location : The M1 northbound between junctions J6 and J8 . Reason : Roadworks are planned. Status : Pending. Schedule : Expect disruption everyday between 22:00 and 05:00 from 11 August 2020 to 15 August 2020. Schedule : Expect disruption everyday between 22:00 and 05:00 from 17 August 2020 to 20 August 2020. Lanes Closed : All lanes will be closed.
Posted: August 4, 2020, 9:12 pm
Location : The M1 northbound between junctions J6A and J8 . Reason : Roadworks scheme is planned. Status : Pending. Schedule : From 22:00 on 11 August 2020 to 05:00 on 20 August 2020.
Posted: August 4, 2020, 9:12 pm
Location : The M1 southbound exit slip at junction J8 . Reason : Roadworks are planned. Status : Pending. Schedule : Expect disruption everyday between 22:00 and 05:00 from 11 August 2020 to 15 August 2020. Schedule : Expect disruption everyday between 22:00 and 05:00 from 17 August 2020 to 20 August 2020. Lanes Closed : All lanes will be closed.
Posted: August 4, 2020, 9:12 pm
Location : The M1 northbound entry slip at junction J6A . Lane Closures : Lanes 1, 2, 3 and 4 will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : Expect disruption everyday between 22:00 and 05:00 from 11 August 2020 to 15 August 2020. Schedule : Expect disruption everyday between 22:00 and 05:00 from 17 August 2020 to 20 August 2020. Lanes Closed : All lanes will be closed.
Posted: August 4, 2020, 9:12 pm
Location : The A414 westbound between the junctions with the A405 and the M1 . Lane Closures : Lanes 1 and 2 will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : Expect disruption everyday between 22:00 and 05:00 from 11 August 2020 to 15 August 2020. Schedule : Expect disruption everyday between 22:00 and 05:00 from 17 August 2020 to 20 August 2020. Lanes Closed : All lanes will be closed.
Posted: August 4, 2020, 9:12 pm
Location : The M1 northbound entry slip at junction J4 . Lane Closures : Lanes 1 and 2 will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : From 22:00 on 10 August 2020 to 05:00 on 11 August 2020. Lanes Closed : All lanes will be closed.
Posted: August 3, 2020, 9:13 pm
Location : The M1 northbound between junctions J1 and J5 . Lane Closures : Lanes 2 and 3 will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : Expect disruption everyday between 22:00 and 05:00 from 10 August 2020 to 12 August 2020. Lanes Closed : There will be two of three lanes closed.
Posted: August 3, 2020, 9:13 pm
Location : The A414 westbound between the junctions with the A405 and the M1 . Lane Closures : The hard shoulder is closed. Reason : Emergency roadworks. Status : Currently Active. Period : expect disruption until 06:00 on 31 March 2021.
Posted: July 31, 2020, 12:29 pm
Location : The A414 eastbound between the junctions with the M1 and the A405 . Lane Closures : The hard shoulder is closed. Reason : Emergency roadworks. Status : Currently Active. Period : expect disruption until 06:00 on 31 March 2021.
Posted: July 31, 2020, 12:29 pm
Location : The M25 anticlockwise exit slip at junction J23 . Reason : Roadworks. Status : Currently Active. Period : expect disruption until 00:01 on 25 November 2020.
Posted: July 31, 2020, 12:29 pm
Location : The A1M southbound at junction J1 . Lane Closures : The hard shoulder is closed. Reason : Road repairs. Status : Currently Active. Period : expect disruption until 00:01 on 25 November 2020.
Posted: July 31, 2020, 12:29 pm
Location : The M1 northbound between junctions J1 and J5 . Lane Closures : The hard shoulder is closed. Reason : Roadworks. Status : Currently Active. Period : expect disruption until 05:00 on 27 November 2030.
Posted: July 31, 2020, 12:27 pm

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The M5 through the West Country is currently experiencing severe delays southbound.
Posted: August 8, 2020, 1:44 pm

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