A350 Chippenham Bypass Dualling

Scheme outline

Upgrade of the existing single two-lane A350 Chippenham Bypass to dual two-lane standard between Bumpers Farm Roundabout (A420) and Brook Roundabout immediately to the north. This improvement will link in with the recently improved dual carriageway from Chippenham to the M4, but will not provide a continuous dual carriageway connecting to it.

The approaches to both roundabouts will also be improved to the same standard with short sections of dual carriageway.

In time, Wiltshire Council plan to widen and improve the entire bypass from Lackham to the M4 to the same standard.

Under construction
Other upgrade
for use by all traffic
Highway authority
Wiltshire Council and Swindon and Wiltshire Local Enterprise Partnership


What's happening on this scheme? You can add a progress update if you know more. Add a progress update
5 October 2016

The section either side of the Bumpers Farm is now complete. There are outline plans to complete the remaining sections in 2017, with various options being presented.

3 July 2017

Work commences July 2017 to dual the half-mile section from the Brook roundabout to the Badger roundabout, making the entire run from the Bumpers Farm roundabout to M4 J17 dual carriageway. Then work starts to dual 250m either side of the Chequers and Cepen Park South roundabouts and the short section between them, also adding an extra lane on the A4 either side of its approach to the Chequers roundabout. This will leave the section between the Cepen Park South and Bumpers Farm roundabouts single carriageway, with this to be addressed at a future date.

Further information: http://www.wiltshire.gov.uk/highways-improvements-a350

More information


With thanks to Tim Hewett and Mark Scott for information on this page.