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M23 Junction 8 to Junction 10

Services: Planning & Controls

Value: 158 Million

Sector: Highways

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.


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
  • 12 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


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.

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