Sizewell C related Traffic Management & Road Closures

See below for current and up and coming road closures and traffic management in relation to the Sizewell C project:

Road Closures

Darsham

Willow Marsh Lane, Darsham, is closed until June 2026 to enable the construction of the Northern Park & Ride roundabout and site. Diversion in place via Walpole Road, A144, A12.

Leiston

Abbey Lane, Leiston, is closed until January 2027 to enable the construction of the new railway line. Diversions are in place via Harrow Lane, Hawthorn Road and Pretty Road.

A night-time closure is in place along Lovers Lane and Valley Road from the 22 October to 6 April 20:00 – 05:00. This to enable the installation of power cables, with daytime two-way traffic lights in place. The diversion is via the B1122 and King George’s Avenue.

Buckleswood Road will be closed from 30 March to 22 June. This is to enable the construction of associated railways works. The diversion route is Buckleswood Lane, B1119 Waterloo Avenue, B1122 Station Road.

Pretty Road will be fully closed in the coming months. Details will be included in the works tracker when they are available. The diversion route is Moat Road and B1122.

The B1122 (Abbey Road) between Rowley Mews and Leiston Abbey access, and the western end of Lovers Lane, will be closed on weeknights (8pm to 5am) from 30 March to 2 April and from 7 to 10 April.  Abbey Road Diversion: B1122, A12, A1094, and B1069

Lover’s Lane Diversion: King George’s Avenue and B1122 Abbey Road

The B1122 (Abbey Road) between Rowley Mews and Eastbridge Road will be closed for the full weekend, 8pm Friday 10 April – 5am Monday 13 April. The western end of Eastbridge Road and Lover’s Lane will also be closed.

Abbey Road Diversion: B1122, A12, A1094, and B1069

Lover’s Lane Diversion: King George’s Avenue and B1122 Abbey Road

Eastbridge Road Diversion: Church Lane and Onners Lane will have an advisory one-way system to aid traffic flow between Eastbridge and Theberton.

The B1122 Abbey Road between Rowley Mews and Leiston Abbey access and the western end of Lovers Lane will again be closed for the weekend 24-26 April (8pm Friday to 5am Monday).

Abbey Road Diversion: B1122, A12, A1094, and B1069

Lover’s Lane Diversion: King George’s Avenue and B1122 Abbey Road

Middleton-cum-Fordley

Littlemoor Road, Middleton, closed from 19 November 2025 and is not expected to be reopened.

Yoxford

The B1122 (Middleton Road) will be closed on weeknights (7pm to 5am) from 9 to 27 March for works associated with Yoxford roundabout. Following this, the road will be closed on weeknights from mid-April for B1122 improvements which are due to run until July 2026. We will continue to provide updates on the works tracker.

Friday Street, Benhall

The A12 and A1094 will be closed from 8pm Friday 20 March to 5am Monday 23 March, and 8pm Friday 27 March to 5am Monday 30 March. The A12 diversion route will be A146, A143, A140, A14, A12 and vice versa. The A1094 diversion route southbound is A1094, B1069, A1152 and A12. The A1094 diversion route northbound is A1094, B1069, B1122, A12.

Kettles Lane, Benhall, is closed until Summer 2026 for the construction of the Friday Street roundabout.

Farnham

Hill Farm Road will be fully closed from 12 January 2026 for works associated with the two-village bypass. The diversion route is A12, Tinker Brook Lane, Station Road and Langham Road.

Further closures related to the schemes are being progressed through discussions with Suffolk County Council and will be communicated once approved.

Wickham Market

The slip road from the B1078/B1116 roundabout onto the A12 Northbound will be closed at nights (7pm to 5am) from 7 April to 16 April for works associated with the Southern Park and Ride. The diversion route is the A12 Southbound, around the Melton (Woods Lane) roundabout onto A12 Northbound.

The A12 Northbound will be closed along the dual carriageway section (Ufford and Wickham Market bypass) at nights (8pm to 5am) from 17 to 24 April for resurfacing. Lane 2 Southbound will also be closed to enable the works to be undertaken safely. The diversion route is A1152, A1094, A12.

A shorter section of the A12 Northbound at the Wickham Market junction will then be closed from 24 April to 3 May for resurfacing. Lane 2 Southbound will also be closed to enable the works to be undertaken safely. The diversion route is up the slip-road, across the B1078-B1116 roundabout and down the slip-road to rejoin the A12 Northbound.

Traffic Management

Leiston

Ongoing traffic signals on Lover’s Lane and B1122 Abbey Road.

B1122

Further traffic signals will be in place along the B1122 in March for vegetation maintenance.

From 23 March to 2 April there will be traffic signals on the B1122, Yoxford Road, north of Middleton Moor for works associated with the Sizewell Link Road.

The A12

On the A12 at Tinker brook there will be two-way signals from 9:30 to 3:30 from 16 to 20 March for works associated with the Two Village Bypass.

On the A12, at Friday Street, varying traffic management is in place, including lane closures and traffic signals until Summer 2026 as part of construction of the new roundabout.

On the A12 at Yoxford there will be traffic signals in place from 7pm 30 March to 6am 31 March to enable traffic to switch onto the new roundabout.

Traffic lights will be in place on the A12 at Darsham from 16 February to 17 April for works associated with the Northern Park and Ride roundabout.

B1078 at Wickham Market

Traffic lights will be in place on the B1078-B1116 roundabout between 26 January and 20 March for works associated with the construction of the Southern Park and Ride following Cadent signals on B1116.

Speed restrictions

A12 between Little Glemham and Benhall: a 30mph speed limit in place whilst works are carried out to construct the new by-pass.

A12 Friday Street: a 30mph speed limit in place whilst works are carried out to construct the new roundabout.

A12 between Kelsale and Yoxford: a 30mph speed limit in place whilst works are carried out to construct the Sizewell Link Road and roundabout.

A12 Darsham: a 30mph speed limit in place whilst works are carried out to construct the Northern Park & Ride roundabout.

B1122, Lover’s Lane and Sizewell Gap: a 30mph speed limit in place.

Buckleswood Road and Westward Ho, Leiston: 30 mph speed limits are in place whilst works are carried out to construct the Green Rail Route.

B1125: 30mph and 50mph speed limits are in place associated with the speed cameras.

Eastbridge Road: 30mph speed restrictions are in place whilst works are carried out to construct the Sizewell Link Road.