Following on from our email below, we are writing to provide further details on our plans to carry out improvement works on the ‘Tollgate Triangle’ gyratory, which connects Fornham Road, Thetford Road, Mildenhall Road, and Tollgate Lane in Bury St Edmunds. 

The works are programmed to commence on Monday 29 September 2025 and, at present, we are aiming to complete them by early summer 2026. We will issue further updates during the scheme to advise of progress. 

As advised previously, the project will involve reconfiguring the junction, replacing the current one-way clockwise system to enable two-way traffic in all directions. We have attached a plan to provide greater detail on the works.

In order to minimise the impact on local road users, residents and businesses, the works will be phased, with varying traffic management throughout. Further details regarding each of the phases can be found below.

Phase One

What will we be doing?

The first phase of the works will include the establishment of our site compound and the removal of the current traffic islands. A temporary road surface will be installed on parts of the gyratory as part of this phase. Permanent traffic signals will be reconfigured and relocated to accommodate construction. This phase of works will be completed alongside Cadent’s essential gas works.

On what dates will we be working?

Phase one is scheduled to commence on Monday 29 September 2025 and will continue until Monday 13 October 2025.

At what times will we be working?

• Between 8pm and 6am.
• Please note that Cadent will be working during daytime hours, and Tollgate Lane between Mildenhall Rd and Hanover Close will be closed 24 hours a day to facilitate these works.

What traffic management will be in place?

• During our working hours (between 8pm and 6am), the gyratory will be closed approaching from all directions for the safety of highway users and our operatives. Multiple diversions will be installed to help road users continue their journeys, and these will be signposted.
• The B1106 (Thetford Road) will be closed travelling towards Bury St Edmunds only from Monday 29 September, for 24 hours per day. While this closure is in place, traffic towards Bury St Edmunds will be diverted via B1106, A134, A143 and no vice versa.
• Tollgate Lane will be closed between Hanover Close and the gyratory from Monday 29 September until Monday 13 October, for 24 hours per day. While this closure is in place, multiple diversion routes will be installed for traffic travelling from or to different directions. A graphic showing the various diversion routes for each of the four major routes which run through the gyratory is attached to this email, and the routes will also be signposted.

Phase Two

What will we be doing?

Phase two of the works will involve widening the inner gyratory.

On what dates will we be working?

Phase two will commence once phase one is complete on Monday 13 October. We anticipate this phase of the scheme will finish in early to mid-January 2026, with a break over the Christmas period.

At what times will we be working?

These works will be carried out during the daytime.

What traffic management will be in place?

• The inner lane of the gyratory will be closed. Temporary traffic signals will also be in place.
• The B1106 (Thetford Road) will remain closed travelling towards Bury St Edmunds only from Monday 29 September, for 24 hours per day. While this closure is in place, traffic towards Bury St Edmunds will be diverted via B1106, A134, A143 and no vice versa.

Phase Three and Four

We will provide a further update detailing the third and fourth phases of the scheme, as well as the traffic management required for this, nearer the time. We will also provide another update regarding phase two before it begins. 

As you may already be aware, Cadent commenced their essential gas maintenance works along Fornham Road in August 2025. While these are currently being done under temporary traffic lights, they will utilise our road closure during the first phase of the programme, with Cadent working during the day and us carrying out our works overnight. This collaboration will minimise the need for future road closures, reducing disruption to the local community and highway users.

Please use any contacts within your division or parish to circulate this notification.

If you need more information, please call us on 0345 606 6171 or email customer.services@suffolk.gov.uk

Kind regards,

Suffolk Highways