Sizewell C related Traffic Management, Road Closures & Rail Movements
See below for current and up and coming engineering train movements, road closures and traffic management in relation to the Sizewell C project:
Engineering Train Movements
| Train Movements | Monday | Tuesday | Wednesday | Thursday | Friday | Saturday | Sunday | ||
| Train 1 Inbound | Pass Ipswich | 22:21 | 22:21 | 22:21 | 22:39 | 22:21 | |||
| Arrive TCA | 00:45 | 00:45 | 00:45 | 01:02 | 00:45 | ||||
| Train 2 Inbound | Pass Ipswich | 23:16 | 23:16 | 23:16 | 23:16 | 23:16 | |||
| Arrive TCA | 01:41 | 01:41 | 01:41 | 01:41 | 01:41 | ||||
| Train 1 Outbound | Depart TCA | Not Running | 02:10 | 02:10 | 02:10 | 02:10 | |||
| Pass Ipswich | Not Running | 04:32 | 04:32 | 04:32 | 04:32 | ||||
| Train 2 Outbound | Depart TCA | 03:34 | 03:34 | 03:34 | 03:34 | 03:34 | |||
| Pass Ipswich | 05:45 | 05:45 | 05:45 | 05:45 | 05:41 | ||||
A12 Closures
Marlesford
The A12 at Marlesford will be closed at weeknights (8pm-5am) from 8pm 21 Sept to 5am Saturday 3 October. The diversion route is A1152, B1069, A1094 and vice versa.
Darsham
The A12 at Darsham will be closed at weeknights (8pm-5am) from 5-15 and 19-28 October and for one weekend (8pm 5 November – 5am 9 November) for works associated with a new pedestrian crossing. The diversion route is A12, A14, A140, A143, A12 and vice versa.
Wickham Market
A12 Hacheston Southbound On Slip and A12 Hacheston Southbound Off Slip will be closed for one night (8pm 26 October to 5am 27 October) for vegetation management.
The diversion for the off slip will be A12 southbound, U-turning at the Melton roundabout, A12 northbound. The diversion for the on slip will be B1078, A1152, A12.
A12 Hacheston Northbound On Slip from B1078 to the A12 north will be closed for three nights (27-30 October, 8pm-5am) for resurfacing. The diversion will be southbound on slip, A12 southbound, U-turning at the Melton roundabout, A12 northbound.
B1122 Closures
B1122 will be closed Monday to Thursday weeknights (7pm-5am) from Yoxford roundabout to approximately 50m past Title Road Middleton from 21 September to 6 November for coordinated works associated with the B1122 Early Years scheme and Sizewell Link Road. The southern end of Title Road is also closed. Access to properties located within the closure and between closure points will be maintained throughout.
There will be weekend closures of the B1122 between Potters Street and Lover’s Lane and Eastbridge Road from the B1122 for approximately 300m throughout September, October and November, starting with the weekends of 8pm 25 September to 5am 28 September and 8pm 2 October to 5am 5 October.
The diversion route is A12, A1094, B1069. The diversion route for Eastbridge Road is Baker’s Hill and Onner’s Lane.
We will continue to provide updates on the works tracker including more specific details when they are available.
Other Road Closures
Leiston and Theberton
Buckleswood Lane will be closed at the rail crossing from 11 to 24 October. The diversion route will be Buckleswood Lane, Abbey Road, B1122, B1119 and vice versa.
George Road is closed from 26 May to September 2028 for works associated with the Sizewell Link Road. The diversion route will be Harrow Lane, Abbey Lane and B1122.
Pretty Road will be closed until Q3 2027 for the construction of an overbridge as part of the Sizewell Link Road. The diversion route will be Harrow Lane, Abbey Lane and B1122.
Hawthorn Road will be closed from 10 August 2026 to 30 April 2027 for the construction of the Sizewell Link Road. The diversion route will be Harrow Lane, Abbey Lane and B1122.
Middleton-cum-Fordley
Fordley Road will be closed from 10 August 2026 until Q3 2027 for the construction of the Sizewell Link Road. The diversion route will be Fordley Road, Town Farm Lane, A12, and B1122.
Littlemoor Road, Middleton, has been closed from 19 November 2025 and is not expected to be reopened.
Saxmundham
Between 26 and 30 October, Albion Street/Station Approach, followed by Mill Road/Chantry Road, will be fully closed including the footways to enable rail upgrade works. During the closure window, one of the roads will always remain open, so pedestrians will be able divert via the other level crossing (e.g. when Mill Road is closed pedestrians will be able to route via Albion Street and vice versa).
Farnham
Hill Farm Road has been fully closed from 12 January 2026 for works associated with the two-village bypass. The diversion route is A12, A1094 and Botany Farm Lane and vice versa.
Kettle’s Lane will be closed from 8:30am to 4pm on 20 October for vegetation clearance. The diversion route is A12, A1094.
Stratford St Andrew
Tinker Brook will be closed from 8:30am to 4pm on 21 October for vegetation clearance. The diversion route is Church Road and A12.
Marlesford – local roads
Bell Lane will be closed (7pm to 5am) to the 1 October for approximately 100 metres from its junction with the A12.The diversion route will be Keeper’s Lane and A12.
Ashe Road (south of the A12, aka Marlesford Road) will be closed (7pm to 5am) for approx. 130 metres from the A12 junction from 27 July to 19 September. The diversion route will be Hacheston Road, B1078 and vice versa.
Marlesford Road will be fully closed for approx. 130 metres from the A12 junction from 19 September to 5 October. The diversion route will be Marlesford Road, B1116, A12.
A1094 / B1069
Scottish Power Renewables will close the A1094 / B1069 between 9 November to the 18 December on weeknights (8pm to 6am) to undertake the coordinated improvement scheme with Sizewell C.
Non-Sizewell C Road Closure
Essex and Suffolk Water are closing the B1125 from 9 November 2026 to 1 March 2027 for a renewal scheme. Sizewell C are looking at collaboration with these works and will provide updates when available.
Traffic Management
Leiston
Ongoing traffic signals on Lover’s Lane and B1122 Abbey Road.
Ongoing traffic signals on Buckleswood Road associated with the rail crossing.
Wickham Market
Lane closure with traffic signals on B1078, 8pm-6am, between 8pm Sunday 30 September and 6am 3 November.
Darsham
One lane closure of the A12 during the hours of 09:00 - 15:00 Monday 28 September - 2 October.
Speed restrictions
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.
Sizewell Gap: 30mph speed limit on Sizewell Gap up to Sizewell Haul Road.
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