We are refurbishing the Brynglas Tunnels and repairing the Usk River Bridge.

First published:
29 April 2016
Last updated:

For traffic news visit Traffic Wales.


Project status: current
Region/county: Newport
Start date: February 2016
End date: spring 2018
Design contractors: Capita
Build contractors: Costain Ltd

This project is registered with the Considerate Constructors Scheme (external link).

Why we are doing it

The tunnels were built under old design standards and are no longer compliant with current design standards. In addition, the Usk River Bridge and Malpas Viaduct need essential maintenance.

The works

This work will involve replacing all the mechanical and electrical systems in the tunnels, as well as the carriageways, drainage and the lining of the tunnel. We will also resurface the Usk River Bridge.

We are scheduling construction so that any closures for the main works are mostly overnight. Closures will be between junctions 24 and 28, and will usually be in one direction only. The Southern Distributor Road (the A48) will be used as a diversion for the closed section of tunnel. Local traffic will be able to travel to junctions 25a and 26 to access local routes. We may need to close the tunnel in both directions for short periods of time for safety reasons.

We are nearing completion of the works. Remaining works will mean that road closures will be taking place but are due to finish on the 30 June.

For information on closures visit the Traffic Wales website.


Design: from 29 February 2016 for 24 weeks
Construction start: 20 June 2016
Construction end: spring 2018