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M4 Junction 16 improvement works

Latest news and updates on the project

The team at Junction 16 continue to make steady progress with the works. Not all the planned night works could go ahead from 19 March due to the cold temperatures not being suitable for surfacing works. As the temperatures have picked up overnight however, the surfacing works have now started and the night closures are in place. The upcoming closures are listed below but it should be noted that these closures continue to be weather dependant. Where possible, we will update the council's social media: Twitter @SwindonNews or Facebook @SwindonBoroughCouncil,  if any of the planned closures are cancelled. 

There is currently a team on site installing sign bases, and lamp columns. Ducting is being installed across the roundabout which will be used for street lighting and traffic light cables. Siemens have started to install the new traffic light heads, although these will not be used until at least mid-April as the loops and cabling for the new traffic light system are not completed yet. The team are also preparing the traffic islands for surfacing, which means they are filling the base of the islands with stone, which will allow the tarmac to be laid on top.

This week the team have completed the majority of the kerbing and have finished all the drainage work.

Planned surfacing and lining works   

Overnight works from 8.00pm to 6.00am, Wednesday, 21 March to Thursday, 29 March inclusive, and Tuesday, 3 April.

  • Traffic in contraflow from Great Western Way onto the west side of the junction 16 roundabout and A3102.
  • Frankland Road junction with Great Western Way will be closed and local traffic will be diverted via Frankland Road, Ramsden Road and Blagrove roundabout back to Great Western Way.  
  • The M4 eastbound entry slip road will be closed and traffic will be diverted across junction 16 and onto the A3102 towards Royal Wootton Bassett. At the first island, traffic will be turned around and returned back along the A3102 to join the M4 westbound. At junction 17, exit the M4 and then return eastbound on the M4.  
  • The M4 westbound exit slip road will be closed. Traffic will be directed to continue onto junction 17 to exit and return eastbound on the M4. 
  • Hay Lane will be closed southbound (northbound open) and through traffic will be diverted into Swindon and back to Hay Lane via the A3102, B4006, B4289 and A4289, before joining Redpost Drive, Peglars Way, Mill Lane and Wharf Road.

Overnight works from 8.00pm - 6.00am, Wednesday, 4 April to Friday, 6 April inclusive 

  • Traffic in contraflow on the east side of junction 16 roundabout and temporary 3-way traffic signals will be in place to control traffic.
  • The M4 westbound entry slip road will be closed and traffic will be diverted across junction 16, down Great Western Way to Blagrove roundabout and back up to junction 16 to join the M4 eastbound. Traffic will exit the M4 at junction 15 and return westbound. 
  • The M4 eastbound exit slip road will be closed and traffic will be diverted to junction 15 and then returned along the M4 to exit at junction 16.
  • From Royal Wootton Bassett or Hay Lane to M4 eastbound slip road, traffic will be diverted down Great Western Way to the Blagrove roundabout and back up to junction 16 to join the M4.  
  • From Hay Lane to Great Western Way, traffic will be diverted onto the A3102 towards Royal Wootton Bassett. At the first roundabout, traffic will be returned back along the A3102 and onto junction 16.

Overnight works from 8.00pm to 6.00am, Saturday, 7 April to Sunday, 8 April inclusive

  • Full closure of the A3102 Swindon Road from the J16 roundabout to Spittleborough Farm entrance, for remaining surfacing and lining work.

Junction 16 improvement works plans

Swindon Borough Council is undertaking major works to remodel Junction 16 of the M4. This scheme is part of our plan to improve roads across the network and further enhance the growth and economy of Swindon and Wiltshire.

The scheme will be funded by the Swindon and Wiltshire Local Enterprise Partnership (LEP) and the Wichelstowe Joint Venture. It is being delivered by Swindon Borough Council in partnership with Highways England and Wiltshire Council.

Works are now underway and will ensure the major highway interchange can cope with forecast future traffic levels and cater for future development in the surrounding areas.

Hochtief (UK) Construction Ltd is carrying out the work, which is expected to be complete by Spring 2018.

The junction will be open to traffic at all times, with the exception of the occasional overnight closure, but there is likely to be some disruption to motorists.


Aerial photograph of M4 Junction 16
Overview of redesigned junction
Dedicated right turn from Swindon Road to Hay Lane
A3102 Great Western Way
A3102 Swindon Road
Dedicated right turn from Swindon Road to Hay Lane
B4005 Hay Lane
Proposed carriageway
Proposed footpath
Proposed traffic island


A detailed plan of the new scheme is available to download (PDF) as well as some Frequently Asked Questions (PDF)

For archived information and our latest blogs concerning Junction 16, use the links below:

Further information

If you have questions or comments about the work at Junction 16, please get in touch with us.

Telephone: 01793 445500

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Anyone who would like to receive the latest news relating to the Junction 16 upgrade can subscribe to the Council’s Highways News newsletter

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Last updated: 22 March 2018. Was this information helpful?

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