M23 junctions 8 to 10: smart motorway

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:  2017-18
Cost:  ÂŁ164 million
Status:  CURRENT
Type:  Major Scheme
End date:  2019-20
Programme:  Smart motorways

Have your say

We've introduced a new engagement tool where you can give your views on the project. Please click on the map below to add your comments about specific parts of the route.

Preview image of interactive map for what you would like to see improved along the M23 between Junction 8 and 10

Progress report

We've completed work on an additional lane to increase road space. A 50mph speed limit will remain in place as well as CCTV monitoring and a free recovery service.

What's next?

Work will continue overnight to install technology so this stretch of the M23 becomes a fully operational smart motorway. Stopped vehicle detection technology will be added in the future, as set out in the Transport Secretary’s smart motorway action plan.

Timeline

Date Event
2016 – March 2018 Design works
July 2018 Start of advanced works
September 2018 Start of main works
July 2019 Switch to central reservation
Spring 2020 Completion of main works

Community news

Over the next two years we'll be looking to help and support local community projects, along with our two chosen charities, Kent Air Ambulance and Neuro-Kinex Kids in Crawley, as well as supporting local schools and colleges with STEM work and apprentice/careers advice. We recently undertook a project for a local school to clear land so the children can plant in the spring and grow a sensory garden for the pupils to enjoy.

You can request to be placed on the weekly M23 junction 8 to 10 update regarding the scheme. To sign up for this email: M23J8_10smart@highwaysengland.co.uk

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

This scheme aims to:

  • reduce congestion by smoothing the flow of traffic to improve journey times and make them more reliable
  • facilitate economic growth within the region, by providing much-needed capacity on the motorway
  • maximise motorway capacity while maintaining safety

The scheme in detail

The proposed scheme will enable proactive management of the M23 carriageway, including the link roads from/to the M25 at junction 8, the spur to Gatwick Airport and to junction 10.

The scheme includes:

  • converting the hard shoulder to create a permanent fourth lane between junctions 8 and 10
  • converting the westbound hard shoulder along the spur to Gatwick Airport (towards Junction 9a) to create three permanent lanes
  • redefined junction layouts to accommodate the fourth lane - in particular we're creating a dedicated northbound slip road before junction 9 to minimise congestion as traffic leaves the motorway and heads towards Gatwick airport
  • new gantries with variable message signs, providing customers with better information
  • installing new electronic information signs, signals and CCTV cameras - these will be used to vary speed limits and manage traffic flow and incidents
  • installing 12 emergency areas to use in place of the hard shoulder which include emergency roadside telephones and CCTV cameras to improve emergency service response times
  • improving the central reserve and adding a reinforced barrier to improve safety
  • adding new noise barriers in built up areas
  • carriageway widening to provide new acceleration and deceleration lanes to our maintenance facility, Weatherhill Depot
  • creating a new emergency turn-around facility at Coopers Hill Road to minimise our response times to incidents

Environmental impact

We've considered the full range of environmental topics and found that there will be no significant long-term effects. Temporary effects during construction will be slight changes in views, construction noise, disruption to road users and some loss of habitat. The key issues we've considered are:

  • noise and vibration, air quality, ecology and visual impacts in relation to nearby housing
  • the Site of Special Scientific Interest 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

We've carried out surveys for protected species adjacent to the motorway. Mitigation work will be undertaken within Natural England licenses. The vegetation clearance has to be undertaken at certain times of the year to minimise disruption to wildlife.

We'll retain existing screening planting where possible and propose additional planting upon completion of the scheme to minimise views of the motorway and associated equipment. Much of the M23 between junction 8 and 10 is either in a cutting or on an embankment, so to provide sufficient structural integrity to the new running lane significant earthworks are necessary. We've tried to minimise vegetation clearance, but in some areas it's not always possible.

We're installing new environmental barriers to minimise noise effects. A plan showing the location of the existing and new barriers will be provided in due course. The plans will show the length and the height of the new barriers. The type of barrier being used for this scheme is absorptive as this type takes in noise, reducing the noise energy that reaches residents.

The new lanes (termed lanes 1 and 4) will have low noise pavement. The existing lanes are in good condition and don't require resurfacing as part of this scheme. We'll resurface these lanes when the condition of pavement falls below our required standards.

Project media files and documents

There are no images for this project

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 M23 northbound exit slip at junction J10 . Reason : Roadworks are planned. Status : Pending. Schedule : Expect disruption everyday between 07:00 and 19:00 from 25 May 2020 to 29 May 2020. Lanes Closed : All lanes will be closed.
Posted: May 24, 2020, 6:04 pm
Location : The M25 anticlockwise entry slip at junction J6 . Reason : Emergency barrier repairs are planned. Status : Pending. Schedule : From 21:00 on 27 May 2020 to 05:00 on 28 May 2020. Lanes Closed : All lanes will be closed.
Posted: May 22, 2020, 2:52 pm
Location : The M25 anticlockwise between junctions J7 and J6 . Lane Closures : Lanes 2, 3 and 4 will be closed. Reason : Emergency barrier repairs are planned. Status : Pending. Schedule : From 21:00 on 27 May 2020 to 05:00 on 28 May 2020. Lanes Closed : There will be three of four lanes closed.
Posted: May 22, 2020, 2:52 pm
Location : The M23 southbound between junctions J10 and J11 . Reason : Emergency barrier repairs are planned. Status : Pending. Schedule : From 21:00 on 26 May 2020 to 06:00 on 27 May 2020.
Posted: May 22, 2020, 1:22 pm
Location : The M25 clockwise between junctions J5 and J6 . Lane Closures : Lanes 1 and 2 will be closed. Reason : Emergency barrier repairs are planned. Status : Pending. Schedule : From 21:00 on 26 May 2020 to 05:00 on 27 May 2020. Lanes Closed : All lanes will be closed.
Posted: May 22, 2020, 11:52 am
Location : The M23 northbound entry slip at junction J10 . Reason : Roadworks scheme. Status : Currently Active. Period : from 07:00 on 22 May 2020 to 06:00 on 15 August 2020.
Posted: May 22, 2020, 6:01 am
Location : The M25 clockwise between junctions J8 and J9 . Lane Closures : Lanes 2, 3 and 4 will be closed. Reason : Road repairs are planned. Status : Pending. Schedule : Expect disruption everyday between 21:00 and 05:30 from 26 May 2020 to 29 May 2020. Schedule : From 21:00 on 29 May 2020 to 06:00 on 30 May 2020. Lanes Closed : There will be three of four lanes closed.
Posted: May 22, 2020, 4:31 am
Location : The M23 northbound entry slip at junction J10 . Lane Closures : Lanes 1 and 2 will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : From 20:00 on 25 May 2020 to 06:00 on 26 May 2020. Schedule : Expect disruption everyday between 20:00 and 06:00 from 30 May 2020 to 1 June 2020. Schedule : From 21:00 on 1 June 2020 to 06:00 on 2 June 2020. Schedule : Expect disruption everyday between 21:00 and 06:00 from 3 June 2020 to 6 June 2020. Lanes Closed : All lanes will be closed.
Posted: May 21, 2020, 6:17 pm
Location : The M23 northbound entry slip at junction J8 from the M25 anticlockwise. Lane Closures : Lanes 1 and 2 will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : Expect disruption everyday between 20:00 and 06:00 from 30 May 2020 to 1 June 2020. Schedule : Expect disruption everyday between 06:06 and 07:06 from 6 June 2020 to 7 June 2020. Schedule : Expect disruption everyday between 20:00 and 06:00 from 13 June 2020 to 15 June 2020. Schedule : Expect disruption everyday between 20:00 and 06:00 from 20 June 2020 to 22 June 2020. Lanes Closed : All lanes will be closed.
Posted: May 21, 2020, 6:17 pm
Location : The M23 northbound entry slip at junction J9 . Lane Closures : Lanes 1 and 2 will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : From 20:00 on 25 May 2020 to 06:00 on 26 May 2020. Schedule : Expect disruption everyday between 20:00 and 06:00 from 30 May 2020 to 1 June 2020. Schedule : From 21:00 on 1 June 2020 to 06:00 on 2 June 2020. Schedule : Expect disruption everyday between 21:00 and 06:00 from 3 June 2020 to 6 June 2020. Lanes Closed : All lanes will be closed.
Posted: May 21, 2020, 6:17 pm
Location : The M23 southbound between junctions J9 and J10 . Reason : Roadworks are planned. Status : Pending. Schedule : From 22:00 on 29 May 2020 to 06:00 on 30 May 2020. Schedule : Expect disruption everyday between 20:00 and 06:00 from 1 June 2020 to 3 June 2020. Schedule : Expect disruption everyday between 20:00 and 06:00 from 4 June 2020 to 6 June 2020. Schedule : Expect disruption everyday between 20:00 and 06:00 from 15 June 2020 to 20 June 2020. Lanes Closed : All lanes will be closed.
Posted: May 21, 2020, 6:17 pm
Location : The M23 southbound exit slip at junction J9 . Reason : Roadworks are planned. Status : Pending. Schedule : From 22:00 on 29 May 2020 to 06:00 on 30 May 2020. Schedule : Expect disruption everyday between 20:00 and 06:00 from 1 June 2020 to 3 June 2020. Schedule : Expect disruption everyday between 20:00 and 06:00 from 4 June 2020 to 6 June 2020. Schedule : Expect disruption everyday between 20:00 and 06:00 from 15 June 2020 to 20 June 2020. Lanes Closed : All lanes will be closed.
Posted: May 21, 2020, 6:17 pm
Location : The M23 southbound at junction J8 . Lane Closures : Lanes 1 and 2 will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : From 22:00 on 29 May 2020 to 06:00 on 30 May 2020. Schedule : Expect disruption everyday between 20:00 and 06:00 from 1 June 2020 to 3 June 2020. Schedule : Expect disruption everyday between 20:00 and 06:00 from 4 June 2020 to 6 June 2020. Schedule : Expect disruption everyday between 20:00 and 06:00 from 15 June 2020 to 20 June 2020. Lanes Closed : All lanes will be closed.
Posted: May 21, 2020, 6:17 pm
Location : The M23 southbound between junctions J8 from the M25 clockwise and J9 . Reason : Roadworks are planned. Status : Pending. Schedule : From 22:00 on 29 May 2020 to 06:00 on 30 May 2020. Schedule : Expect disruption everyday between 20:00 and 06:00 from 1 June 2020 to 3 June 2020. Schedule : Expect disruption everyday between 20:00 and 06:00 from 4 June 2020 to 6 June 2020. Schedule : Expect disruption everyday between 20:00 and 06:00 from 15 June 2020 to 20 June 2020. Lanes Closed : All lanes will be closed.
Posted: May 21, 2020, 6:17 pm
Location : The M23 southbound exit slip at junction J10 . Reason : Roadworks are planned. Status : Pending. Schedule : From 22:00 on 29 May 2020 to 06:00 on 30 May 2020. Schedule : Expect disruption everyday between 20:00 and 06:00 from 1 June 2020 to 3 June 2020. Schedule : Expect disruption everyday between 20:00 and 06:00 from 4 June 2020 to 6 June 2020. Schedule : Expect disruption everyday between 20:00 and 06:00 from 15 June 2020 to 20 June 2020. Lanes Closed : All lanes will be closed.
Posted: May 21, 2020, 6:17 pm
Location : The M23 southbound entry slip at junction J8 from the M25 anticlockwise. Lane Closures : Lanes 1 and 2 will be closed. Reason : Roadworks are planned. Status : Pending. Schedule : From 22:00 on 29 May 2020 to 06:00 on 30 May 2020. Schedule : Expect disruption everyday between 20:00 and 06:00 from 1 June 2020 to 3 June 2020. Schedule : Expect disruption everyday between 20:00 and 06:00 from 4 June 2020 to 6 June 2020. Schedule : Expect disruption everyday between 20:00 and 06:00 from 15 June 2020 to 20 June 2020. Lanes Closed : All lanes will be closed.
Posted: May 21, 2020, 6:17 pm
Location : The M23 southbound between junctions J8 from the M25 clockwise and J9 . Reason : Roadworks scheme is planned. Status : Pending. Schedule : From 20:00 on 25 May 2020 to 06:00 on 22 August 2020.
Posted: May 21, 2020, 6:17 pm
Location : The M23 southbound entry slip at junction J8 from the M25 clockwise. Reason : Roadworks are planned. Status : Pending. Schedule : Expect disruption everyday between 20:00 and 06:00 from 25 May 2020 to 29 May 2020. Schedule : Expect disruption everyday between 20:00 and 06:00 from 30 May 2020 to 1 June 2020. Schedule : From 20:00 on 3 June 2020 to 06:00 on 4 June 2020. Schedule : Expect disruption everyday between 22:00 and 06:00 from 8 June 2020 to 13 June 2020. Lanes Closed : All lanes will be closed.
Posted: May 21, 2020, 6:17 pm
Location : The M23 northbound between junctions J10A and J10 . Lane Closures : Lane one is closed. Reason : Roadworks. Status : Currently Active. Period : expect disruption until 06:00 on 29 August 2020. Lanes Closed : There is one of three lanes closed.
Posted: May 21, 2020, 12:37 pm
Location : The A23 southbound. Reason : Emergency barrier repairs are planned. Status : Pending. Schedule : From 21:00 on 27 May 2020 to 06:00 on 28 May 2020. Lanes Closed : All lanes will be closed.
Posted: May 21, 2020, 12:32 pm
Location : The M23 northbound between junctions J10A and J8 . Reason : Roadworks scheme. Status : Currently Active. Period : from 12:24 on 29 April 2020 to 06:00 on 29 August 2020.
Posted: May 21, 2020, 12:32 pm
Location : The M25 clockwise at junction J6 . Lane Closures : Lane one will be closed. Reason : Road repairs are planned. Status : Pending. Schedule : Expect disruption everyday between 22:00 and 05:00 from 26 May 2020 to 29 May 2020. Lanes Closed : There will be one of three lanes closed.
Posted: May 21, 2020, 12:32 pm
Location : The M25 anticlockwise between junctions J6 and J5 . Reason : Emergency barrier repairs. Status : Currently Active. Period : from 17:13 on 6 January 2020 to 00:01 on 30 May 2020. Lanes Closed : There are lane closures.
Posted: May 21, 2020, 12:32 pm
Location : The M25 clockwise entry slip at junction J6 . Lane Closures : Lane one will be closed. Reason : Road repairs are planned. Status : Pending. Schedule : Expect disruption everyday between 22:00 and 05:00 from 26 May 2020 to 29 May 2020. Lanes Closed : There will be one of two lanes closed.
Posted: May 21, 2020, 12:32 pm
Location : The M25 clockwise between junctions J6 and J7 . Lane Closures : Lane one will be closed. Reason : Road repairs are planned. Status : Pending. Schedule : Expect disruption everyday between 22:00 and 05:00 from 26 May 2020 to 29 May 2020. Lanes Closed : There will be one of four lanes closed.
Posted: May 21, 2020, 12:32 pm

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