M23 junctions 8 to 10: smart motorwayRecently updated

Upgrading the 11 mile (18km) stretch of the M23 near Gatwick Airport, between junction 8 near Merstham and junction 10 at Copthorne, to an all-lane running smart motorway.

Region:  South East
Start date:  March 2018
Cost:  £158.4 million
Status:  PLANNED
Type:  Major Scheme
End date:  January 2020
Programme:  Smart Motorways

Progress report

We are currently designing the smart motorway scheme on M23 junctions 8 to 10 following the government’s announcement of this scheme in 2015.

We have been carrying out a range of surveys and assessment work to give us information about traffic volumes and the local environment. We have also been working with local authorities and technical stakeholders so we can consider their views. This information is helping us to develop the best design solution to meet the aims we have for this scheme.

What next?

Once we have worked up our proposed design we will invite you to our public information exhibitions. You will be able to learn more about smart motorways, our plans for the M23 in particular, and meet members of the project teams. We hope to do this in September 2017.

Why we need this scheme

The M23 is a crucial part of the UK strategic road network connecting Crawley and Gatwick Airport to the M25 motorway, routes into London and the rest of the UK.

This stretch of the M23 is heavily used by traffic travelling to and from Gatwick Airport and between Brighton and London, especially during UK holiday periods. As a result safety, congestion and journey times are all key issues that need to be improved.

As junction 9 of the M23 is the main access for traffic travelling to and from Gatwick Airport, this scheme is of particular local and national economic and political importance.

Aims

With this scheme, we aim to improve:

  • safety
  • congestion
  • journey times

Learn more about how to drive on smart motorways.

The scheme in detail

The M23 junction 8 to 10 smart motorway scheme will add further road space by converting the hard shoulder to a permanent running lane with additional traffic monitoring, emergency refuge areas and variable message signs. The work will include:

  • four permanent running lanes in each direction, created by conversion of the hard shoulder
  • redefined junction layouts to accommodate the extra lane
  • 16 new gantries to carry the new variable message signs
  • 11 new emergency refuge areas
  • a hardened central reserve with a new rigid concrete barrier
  • new noise barriers where identified by environmental assessment
  • work to maintain access to the motorway from Weatherhill Depot and for traffic officers

Construction

During the construction phase of the scheme, roadworks will be needed along this section of the M23 between junctions 8 and 10. It is anticipated that narrow lanes traffic management, temporary concrete safety barriers and speed restrictions will be put in place. In addition junction layouts may be temporarily altered to allow for resurfacing and improvement.

There will be temporary closures of the carriageways at night on some occasions. In these instances all updates and diversions will be clearly available and published in the appropriate section of the scheme’s webpage. Clearly signed diversions will be put in place where the work is being carried out.

Environmental impact

Highways England is committed to delivering better environmental outcomes. In remaining within current motorway boundaries, smart motorways have the built-in advantage of minimising scheme environmental footprints. In addition, we carry out thorough environmental assessments to identify and assess potential environmental impacts and recommend mitigation that can be included in the scheme to minimise them.

M23 junction 8 to 10 environmental assessment

We have considered the full range of environmental topics and found that there will be no long term significant effects. Temporary effects during construction will be slight changes in views, construction noise, disruption to road users and some loss of habitat of negligible value. A comprehensive Construction Environment Management Plan will minimise these effects.

The key issues considered are:

  • air quality, noise and visual impacts in relation to nearby housing
  • the SSSI between Mole Gate and Reigate Escarpment
  • protected species and habitats including bats, badgers and great crested newts
  • the setting of conservation areas and heritage assets such as Surrey Hills Area of Outstanding Natural Beauty
  • public rights of Way

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 J6 and J7 . Lane Closures : Lanes 3 and 4 will be closed. Reason : Emergency barrier repairs are planned. Status : Pending. Schedule : From 22:00 on 20 July 2017 to 05:00 on 21 July 2017. Lanes Closed : There will be two of four lanes closed.
Posted: July 20, 2017, 4:21 pm
Location : The A23 northbound between the A272 and the junction with the M23 . Lane Closures : Lanes 1 and 2 will be closed. Reason : Roadside drains works are planned. Status : Pending. Schedule : From 20:00 on 21 July 2017 to 06:00 on 22 July 2017. Schedule : Expect disruption everyday between 20:00 and 06:00 from 24 July 2017 to 26 July 2017. Lanes Closed : There will be two of three lanes closed.
Posted: July 20, 2017, 4:21 pm
Location : The M25 clockwise between junctions J5 and J6 . Lane Closures : Lanes 3 and 4 will be closed. Reason : Emergency barrier repairs are planned. Status : Pending. Schedule : From 22:00 on 20 July 2017 to 05:00 on 21 July 2017. Lanes Closed : There will be two of four lanes closed.
Posted: July 20, 2017, 4:21 pm
Location : The A23 northbound. Reason : Roadside drains works are planned. Status : Pending. Schedule : From 20:00 on 26 July 2017 to 06:00 on 27 July 2017. Lanes Closed : All lanes will be closed.
Posted: July 20, 2017, 4:21 pm
Location : The M25 anticlockwise at junction J6 . Lane Closures : Lane three will be closed. Reason : Emergency barrier repairs are planned. Status : Pending. Schedule : From 22:00 on 20 July 2017 to 05:00 on 21 July 2017. Lanes Closed : There will be one of three lanes closed.
Posted: July 20, 2017, 4:21 pm
Location : The M23 southbound entry slip at junction J8 from the M25 anticlockwise. Lane Closures : Lane two will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : From 23:00 on 21 July 2017 to 06:00 on 22 July 2017. Lanes Closed : There will be one of two lanes closed.
Posted: July 20, 2017, 4:21 pm
Location : The A23 northbound between the A272 and the junction with the M23 . Lane Closures : Lanes 1 and 2 will be closed. Reason : Roadside drains works are planned. Status : Pending. Schedule : From 20:00 on 26 July 2017 to 06:00 on 27 July 2017. Lanes Closed : There will be two of three lanes closed.
Posted: July 20, 2017, 4:21 pm
Location : The M25 anticlockwise at junction J7 . Lane Closures : Lanes 1 and 2 will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : From 23:00 on 21 July 2017 to 06:00 on 22 July 2017. Lanes Closed : There will be two of three lanes closed.
Posted: July 20, 2017, 4:21 pm
Location : The M25 clockwise at junction J6 . Lane Closures : Lane three will be closed. Reason : Emergency barrier repairs are planned. Status : Pending. Schedule : From 22:00 on 20 July 2017 to 05:00 on 21 July 2017. Lanes Closed : There will be one of three lanes closed.
Posted: July 20, 2017, 4:21 pm
Location : The M25 anticlockwise between junctions J6 and J5 . Lane Closures : Lanes 3 and 4 will be closed. Reason : Emergency barrier repairs are planned. Status : Pending. Schedule : From 22:00 on 20 July 2017 to 05:00 on 21 July 2017. Lanes Closed : There will be two of four lanes closed.
Posted: July 20, 2017, 4:21 pm
Location : The M25 anticlockwise entry slip at junction J8 . Lane Closures : Lane one will be closed. Reason : Horticultural works are planned. Status : Pending. Schedule : Expect disruption everyday between 22:00 and 05:00 from 24 July 2017 to 28 July 2017. Schedule : From 23:00 on 28 July 2017 to 05:00 on 29 July 2017. Schedule : Expect disruption everyday between 22:00 and 05:00 from 29 July 2017 to 4 August 2017. Schedule : From 23:00 on 4 August 2017 to 05:00 on 5 August 2017. Lanes Closed : There will be one of two lanes closed.
Posted: July 20, 2017, 4:21 pm
Location : The M25 anticlockwise between junctions J8 and J7 . Lane Closures : Lanes 1 and 2 will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : From 23:00 on 21 July 2017 to 06:00 on 22 July 2017. Lanes Closed : There will be two of four lanes closed.
Posted: July 20, 2017, 4:21 pm
Location : The M25 anticlockwise between junctions J7 and J6 . Lane Closures : Lanes 3 and 4 will be closed. Reason : Emergency barrier repairs are planned. Status : Pending. Schedule : From 22:00 on 20 July 2017 to 05:00 on 21 July 2017. Lanes Closed : There will be two of four lanes closed.
Posted: July 20, 2017, 4:21 pm

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