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:  ¬£164 million
Status:  CURRENT
Type:  Major Scheme
End date:  2019/20
Programme:  Smart Motorways

Progress report

The consultation for the implementation of Variable Mandatory Speed limits (VMSL) between junctions 8 and 10, and the permanent 50mph speed limit on the westbound carriageway of the Gatwick Spur from the M23 junction 9 to 9a, was undertaken between 11 December 2017 and 15 January 2018. The summary of comments received and our responses can be found in the consultation report.

We can now announce the formal commencement of the scheme with our delivery partner, Kier.

We are regularly communicating with Surrey and West Sussex County Council and working closely with Gatwick Airport to issue joint communications when major work is taking place. The Smart Motorways Project can also be found on the Gatwick Airport App and web page.

Early environmental works are nearing completion. These have included vegetation and tree clearing along the verge. The clearance was undertaken to accommodate new retaining walls, environmental (noise) barriers, gantries and emergency areas as part of the scheme.

What's next?

Advanced works commenced in July 2018. These involved pre-construction surveys, establishing a site compound, which is now in operation, and installation of temporary CCTV and narrow lanes.

Our next works will involve the removal of the gantry signs which are in situ across the carriageways and this will take place in September under lane closures only.

Our next full closure is planned for 7/8/9 December between 10pm and 4am in both directions. Please check the Roadworks tab below for more details, as dates and times are subject to change.

Timeline

Date Event
2016 ‚Äď March 2018 Design works
July 2018 Start of advanced works
September 2018 Start of main works
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 2 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.

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 are 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 (SOS) 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 have 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 SSSI (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 have 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 M25 clockwise between junctions J8 and J9 . Lane Closures : Lane one will be closed. Reason : Road repairs are planned. Status : Pending. Schedule : From 22:00 on 24 November 2018 to 06:00 on 25 November 2018. Lanes Closed : There will be one of four lanes closed.
Posted: November 17, 2018, 11:15 pm
Location : The A23 southbound. Lane Closures : Lane two will be closed. Reason : Emergency roadworks are planned. Status : Pending. Schedule : Expect disruption everyday between 22:00 and 04:00 from 19 November 2018 to 21 November 2018. Lanes Closed : There will be one of two lanes closed.
Posted: November 17, 2018, 11:15 pm
Location : The M25 anticlockwise between junctions J9 and J8 . Reason : Emergency barrier repairs are planned. Status : Pending. Schedule : From 09:30 on 23 November 2018 to 16:00 on 23 November 2018.
Posted: November 17, 2018, 11:15 pm
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 : Expect disruption everyday between 21:00 and 06:00 from 22 November 2018 to 27 November 2018. Lanes Closed : All lanes will be closed.
Posted: November 17, 2018, 11:15 pm
Location : The M25 anticlockwise between junctions J9 and J8 . Reason : Emergency roadworks are planned. Status : Pending. Schedule : From 09:30 on 19 November 2018 to 16:00 on 19 November 2018.
Posted: November 17, 2018, 11:15 pm
Location : The M23 northbound exit slip at junction J10 . Reason : Roadworks are planned. Status : Pending. Schedule : From 21:00 on 16 November 2018 to 05:30 on 17 November 2018. Schedule : Expect disruption everyday between 21:00 and 06:00 from 19 November 2018 to 22 November 2018. Schedule : Expect disruption everyday between 21:00 and 06:00 from 27 November 2018 to 1 December 2018. Lanes Closed : All lanes will be closed.
Posted: November 17, 2018, 11:15 pm
Location : The M25 anticlockwise entry slip at junction J8 . Lane Closures : Lanes 1 and 2 will be closed. Reason : Emergency roadworks are planned. Status : Pending. Schedule : From 22:00 on 21 November 2018 to 05:00 on 22 November 2018. Lanes Closed : All lanes will be closed.
Posted: November 17, 2018, 11:15 pm
Location : The M23 westbound between junctions J9 and J9A . Lane Closures : Lane two will be closed. Reason : Emergency roadworks are planned. Status : Pending. Schedule : Expect disruption everyday between 22:00 and 04:00 from 19 November 2018 to 21 November 2018. Lanes Closed : There will be one of two lanes closed.
Posted: November 17, 2018, 11:15 pm
Location : The A23 northbound. Lane Closures : Lane two will be closed. Reason : Emergency roadworks are planned. Status : Pending. Schedule : Expect disruption everyday between 22:00 and 04:00 from 19 November 2018 to 21 November 2018. Lanes Closed : There will be one of two lanes closed.
Posted: November 17, 2018, 11:15 pm
Location : The M23 northbound between junctions J10A and J7 . Reason : Roadworks scheme. Status : Currently Active. Period : from 21:01 on 12 November 2018 to 06:00 on 10 December 2018.
Posted: November 17, 2018, 11:15 pm
Location : The M25 anticlockwise between junctions J9 and J8 . Reason : Emergency barrier repairs are planned. Status : Pending. Schedule : Expect disruption everyday between 09:30 and 16:00 from 20 November 2018 to 22 November 2018.
Posted: November 17, 2018, 11:15 pm
Location : The M23 SPUR eastbound between junctions J9A and J9 . Lane Closures : Lane two will be closed. Reason : Emergency roadworks are planned. Status : Pending. Schedule : Expect disruption everyday between 22:00 and 04:00 from 19 November 2018 to 21 November 2018. Lanes Closed : There will be one of two lanes closed.
Posted: November 17, 2018, 11:15 pm
Location : The M25 anticlockwise between junctions J9 and J8 . Lane Closures : Lane one will be closed. Reason : Emergency roadworks are planned. Status : Pending. Schedule : Expect disruption everyday between 22:00 and 05:00 from 19 November 2018 to 23 November 2018. Schedule : From 23:00 on 23 November 2018 to 05:00 on 24 November 2018. Lanes Closed : There will be one of four lanes closed.
Posted: November 17, 2018, 11:15 pm
Location : The M25 anticlockwise between junctions J6 and J5 . Lane Closures : Lanes 1 and 2 will be closed. Reason : Horticultural works are planned. Status : Pending. Schedule : Expect disruption everyday between 22:00 and 05:00 from 19 November 2018 to 23 November 2018. Schedule : From 23:00 on 23 November 2018 to 05:00 on 24 November 2018. Schedule : Expect disruption everyday between 22:00 and 05:00 from 26 November 2018 to 29 November 2018. Lanes Closed : There will be two of four lanes closed.
Posted: November 17, 2018, 11:15 pm
Location : The M25 clockwise between junctions J8 and J10 . Reason : Emergency roadworks are planned. Status : Pending. Schedule : Expect disruption everyday between 09:30 and 16:00 from 19 November 2018 to 23 November 2018. Schedule : Expect disruption everyday between 09:30 and 16:00 from 26 November 2018 to 30 November 2018.
Posted: November 17, 2018, 11:15 pm
Location : The M25 anticlockwise between junctions J9 and J8 . Lane Closures : Lanes 1 and 2 will be closed. Reason : Emergency roadworks are planned. Status : Pending. Schedule : From 22:00 on 22 November 2018 to 05:00 on 23 November 2018. Schedule : From 23:00 on 23 November 2018 to 05:00 on 24 November 2018. Lanes Closed : There will be two of four lanes closed.
Posted: November 17, 2018, 11:15 pm
Location : The M25 clockwise between junctions J5 and J6 . Lane Closures : Lanes 3 and 4 will be closed. Reason : Emergency litter clearance is planned. Status : Pending. Schedule : From 22:00 on 22 November 2018 to 05:00 on 23 November 2018. Lanes Closed : There will be two of four lanes closed.
Posted: November 17, 2018, 11:15 pm

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