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decorative image of the A55

We are addressing network issues on this section of the A55.

Under construction
Region / County:
north-west Wales (Gwynedd)
Start date:
autumn 2020
End date:
autumn 2022
£30 million (including £20.775 million EU funding)
First published:
31 July 2018
Last updated:


Why we are doing it

The A55 is the main north Wales coastal route and is part of Euroroute E22 Trans-European Transport Network (TEN-T). It is also an important link, via county roads, for local towns and communities and provides a connection with the north-south A470 to south and central Wales.

This section of the A55 was upgraded to a dual carriageway in the late 1960s and does not comply with current highway standards. The section is prone to flooding.

Current progress

We have finished building the new length of county road.

This road will:

  • be used for agricultural access and farm access
  • be used as a temporary eastbound route between junction 12 and 13 to while we work on the A55 eastbound road
  • be an active travel route once the main works are done, so it will be safer to walk and cycle

We have built the Wig underpass across the new length of county road. This will make it easier and safer to cross the road.

We have also put in culverts to make it easier for water to flow under the county road.

We have diverted the eastbound traffic on the A55 onto part of the new length of the county road. This is to maintain two lanes of eastbound traffic on the A55.


Publication of draft orders: autumn 2016
Enabling works contract commencement: late 2018
Completion of enabling works contract: spring 2019
Start of main works construction: autumn 2020
Completion of new section of trunk road: spring 2023

Next steps

We started work to improve the eastbound side of the road in autumn 2021 and this work will continue until spring 2023.

What we're doing

We are improving safety along a 2.2km stretch of the A55 by:

  • removing direct accesses off the A55
  • removing eight gaps in the central reservation

Gaps in the central reservation allow slow moving vehicles to cross the A55. This poses a risk to road users.

We are replacing these areas with:

  • combined access road
  • active travel route between junction 12 and 13

We are improving the road's drainage system to reduce the risk of flooding in the area. Improvements have previously been made through drainage work carried out in 2017.

To minimise disruption, we have completed most works off the A55. This includes construction of the 1.3km combined access and active travel route.

We have secured £20.775 million through the European Regional Development Fund to deliver these improvements.

Cronfa Datblygu Rhanbarthol Ewrop


Reports, environmental statements and plans