A46 package – Cold Ashton roundabout to London Road junction roundabout
We're investing almost £6million to improve the A46 north of Bath between London Road junction roundabout and Cold Ashton roundabout.
How we'll work
To work safely, we’ll mainly use combinations of lane closures and weeknight full closures.
Where needed, we'll put signed diversions in place.
We'll give details of where we're working and the traffic management we're using on this page.
Phase one - 18 January to 20 March 2026
Charmy Downs
We'll perform ground investigation surveys and instal monitoring equipment. This helps us plan future improvements.
Hartley Bends
We're installing new, upgraded chevron signs to improve road safety.
Closures and traffic management
18 January to 20 March - A46 between Cold Ashton roundabout and London Road junction roundabout
Closed in both directions overnight (8pm - 6am) Monday to Friday.
Signed north and southbound diversion by -
- A420 (Marshfield)
- A350
- A4 (Corsham / Box)
We'll maintain access to properties on the A46 directly within our closure. Please speak to the site team at the nearest closure point and we'll escort you through the works.
18 January to 20 March - A46 northbound at Charmy Down
Lane closures on the three lane section during our works. One lane will be running in each direction with contraflow in place.
Please plan ahead and allow extra time for your journeys.
Please remember that closures can change at short notice. You can check the latest information on our daily closures page or find live travel information on our Traffic England site. Our travel alerts give details of live incidents on our network.
If we can't complete our work as planned, we may need more time. We'll give details on this page.
A46 road markings and stud replacement (M4 J18 - Cold Ashton roundabout)
We're renewing road markings and replacing road studs along the A46 between M4 J18 and Cold Ashton roundabout.
To keep disruption to a minimum, we'll work under a series of weekend, night time closures.
Closures
The A46 will be closed in both directions between M4 J18 and Cold Ashton roundabout, Saturday and Sunday nights (8pm – 6am) on:
- Saturday 7 February and Sunday 8 February
- Saturday 14 February and Sunday 15 February
- Saturday 21 February and Sunday 22 February
The A46 will be open as usual during the day.
The M4 will remain open throughout.
Diversions
Well signed diversion routes will be in place.
For southbound traffic, diversions will be via:
- the B4465
- the A4174
- the A420
Northbound traffic to follow in reverse.
Access will be maintained to properties on the A46 directly within the closure. Please speak to the site team at the nearest closure point to be escorted through the works.
Please plan ahead and allow extra time for your journeys.
Dates may change at short notice due to poor weather conditions or operational reasons. If we’re unable to complete our work as planned, we may need to continue beyond the dates stated above.
We’ll make every effort to ensure the impact on local community and travelling public is kept to a minimum. Please accept our apologies in advance for any inconvenience this work may cause.
Please remember that closures can change at short notice. You can check the latest information on our daily closures page or find live travel information on our Traffic England. Our travel alerts give details of live incidents on our network.
Project information
The A46 is part of our south western strategic road network - a vital link between Bath and the M4.
It connects the south coast with Bristol, Bath and London, as well as carrying local traffic.
Our improvements will make journeys safer, smoother and more reliable. They'll also reduce the need for future unplanned closures.
This year, we have several essential schemes on the A46, split into three phases
Phase one - January to March 2026
Charmy Downs - ground investigation surveys and monitoring devices.
Hartley Bends - new, upgraded chevron signs.
Phase two
Four Winds Farm - drainage improvements.
Phase three
Hartley Bends - resurfacing .
Documents
Traffic information
Information about scheduled roadworks and events on our motorways and major roads.Sign up for updates!
Keep up to date with what's happening on this scheme by signing up to our updates.
