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We are looking to build a 3rd bridge over the Menai Strait.

First published:
1 July 2017
Last updated:

This project is under review

This project is currently being considered as part of the roads review.


Project status: planned
Region/county: north Wales (Gwynedd/Anglesey)
Start date: 2020/2021
End date: 2022/2023
Cost: over £130m dependant on option selected
Design Consultants: AECOM/RML/Knight Architects.

Why are we doing it

The A55 is important locally, nationally and internationally. It provides the main economic artery for North Wales and forms part of the route Euro 22 on the Trans European Road network. Britannia Bridge is the only section within the UK that is not dual carriageway, and this acts as a significant bottleneck to commuter and holiday traffic.

The aims of the scheme are to:

  • improve capacity, reliability and journey times
  • improve network resilience
  • improve opportunities for non motorised users 
  • improve safety.

Current progress

A recent study concluded that improving capacity by introducing a three lane tidal flow configuration on the existing Britannia Bridge did not meet the required safety standards.

A Strategic Outline Business case was completed in Spring 2016 which confirmed the need for a 3rd Menai Crossing.

We have appointed consultants AECOM and RML to undertake a route selection study with a view to selecting a preferred route for the crossing.

We published the summary of responses for this consultation in October.


Start Procuring Technical Advisors: Autumn 2016
Route Selection Study: Late 16 to Spring 18
Announcement of preferred route: Summer 2018

Next steps

We will appoint technical advisors to develop a preliminary design. The design looks at environmental and engineering issues in more detail. It also considers comments made during the consultation.

We will also carry out a detailed review to confirm the type of bridge and the selection of the two or four lane crossing.


How we are consulting

We held a public consultation between November 2007 and February 2008.

A 12 week public consultation on the options was undertaken between December 2017 and March 2018.