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A4 Cross Keys Corsham

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A4 Cross keys, Corsham

Wiltshire Council will be undertaking work to replace the traffic signals on the A4 Cross Keys junction in Corsham. The traffic signals are reaching the end of there life expectancy and has been highlighted as one of the most vunerable traffic signal installations in Wiltshire. The work will be funded by the Department of Transport with Wiltshire Council also allocating funds to upgrade the system.

Outline Programme

Work Begins
22 July 2019
Full Road closures of Biddestone Road & Cross Keys installed
22 July 2019
Site Clearance
Late July
Construction Phase
Late July - Late August
Footway Surfacing
Carriageway Surfacing
Late August
Work Completion
Early September


A recent study has been completed by Atkins on behalf of Wiltshire Council to assess the current condition and future life expectancy of traffic signal installations across the county of Wiltshire.  The study sought to identify the most vulnerable installations in terms of age and “wear and tear”.  One of the most vulnerable installations is the traffic signal junction at A4 Cross Keys / Biddestone Rd, Corsham.  Following receipt of funding from the Department of Transport Wiltshire Council will use some of this funding to refurbish and upgrade the traffic signal junction at A4 Cross Keys/Biddestone Rd Corsham.  As part of the works changes to the kerb alignment on the A4 will be made to reduce vehicle conflict.


The main work will involve

  • Removal of the existing traffic signals
  • Altered kerbline on the A4 to reduce vehicle conflict 
  • Installation of refurbished/upgraded traffic signals
  • Provision of pedestrian facilities on A4 Bath Rd within the refurbished signal junction.
  • Re-surfaced footways with coloured surfacing
  • Improved signing and lining

The main works started week commencing 22 July 2019.


The main works are to be delivered during the Wiltshire School summer holidays which notionally start around the end of July. Traffic flows are at there lowest during the school summer holidays, it was therefore decided in an effort to minimise disruption that works would take place during this period.


Efforts will be made to reduce the impact of works to highway users. A number of methods will be used during the construction period such as:

  • Closure of Cross Keys Rd and Biddestone Rd rather than the need for temporary 4 way lights at all times 
  • Closure of Cross Keys Rd and Biddestone Rd which shorten the duration of the works
  • Closure of the A4 Bath Rd will only be undertaken at night
  • Advanced Information Signs displayed
  • Use of Twitter @WiltshireRoads to keep residents and drivers informed
  • Regular updates via website
  • Liaison with other works nearby

Yes there will be a programme of works at night to minimise disruption throughout the day.
The contractor will provide a programme of works outlining exactly how they plan to deliver the scheme.

The programme of traffic changes and any planned road closures will be shown on this webpage and also published on the @WiltshireRoads twitter account.


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Construction Drawings

Traffic Management

Phase 1

During phase 1 it will be necessary to close Cross Keys road and Biddestone road to keep the A4 moving and to allow for work to be undertaken with the least impact.

Lane widths will be reduced during this period to allow both East and Westbound traffic on the A4 to continuing moving. It will also be necessary at times to use two way temporary traffic signals

Phase 2

Following phase 1 a series of full night time road closures will be required to allow carriageway surfacing to take place. The A4, Cross keys road and Biddestone road will all be closed to facilitate this phase. The closures will be in place between 8pm and 6am, it is anticipated that these works will take around 5 nights to complete. Further information concerning the dates of these closures will be available as we move forward.

Further information regarding the closures and diversion routes can be found on our Streetworks map

Last updated: 22 July 2019 | Last reviewed: 22 July 2019