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The Welsh Government’s traffic information service for motorways and trunk roads in Wales

Extended Tunnel Closure Programme - A55


Where and Why?

Work to carry out essential repairs and maintenance of Tunnel Life Safety equipment and also replacement of manhole covers.

The programme of closures is currently scheduled to run until December 10th and will include overnight bore closures and some daytime lane closures. There will be a 3.2 m width restriction in force for the duration of the works when traffic management is in place.

These works are initially being undertaken during the coronavirus firebreak period when traffic flows are dramatically reduced in order to minimise the impact on the travelling public. The opportunity will be taken to undertake works of a duration that would mean they could not be accommodated during the usual maintenance closure periods.

Diversions and Safety Measures

Details of Restriction

Start Date and Time*

End Date and Time*

Conwy Tunnel Westbound bore overnight closure

25/11/2020 19:00

26/11/2020 7:00

Conwy Tunnel Westbound bore overnight closure 

26/11/2020 19:00

27/11/2020 7:00

Conwy Tunnel Westbound bore overnight closure 

27/11/2020 19:00

28/11/2020 7:00

Conwy Tunnel Eastbound bore closure 

28/11/2020 19:00

29/11/2020 19:30

Conwy Tunnel Westbound bore overnight closure

29/11/2020 19:30

30/11/2020 7:00

Pen y Clip Tunnel

30/11/2020 19:30

01/12/2020 7:00


Pen y Clip Headland

01/12/2020 19:30



*These works are complex and critical to safety. If issues are encountered overnight additional daytime bore closures may be required.

  • The bore closed in Conwy Tunnel for any particular night may differ from those listed above dependant on the progress of works and the requirements of the project. This will, however, not affect the restrictions in place for abnormal loads and other traffic.
  • Waiting areas will be available to hauliers of abnormal loads. They are located in the vicinities of Junction 23 (Llanddulas) and Junction 14 (Madryn). 
  • There will be no provision for the escort of wide loads through the works either overnight or during the daytime lane closures on the 1st and 8th November.


For further information, please contact Traffic Wales on 0300 123 1213 or via Twitter @TrafficWalesN.

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0300 123 1213
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