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M4: junction 28

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Economy and Infrastructure Secretary Ken Skates today cut the turf at Junction 28 of the M4 to mark the start of £13.7 million of improvement work at the site.
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We are improving the M4 J28 Tredegar Park roundabout, the A467 Bassaleg roundabout, and the Southern Distributor Road (SDR) Pont Ebbw roundabout in partnership with Newport City Council.


Project status: Planned
Region/county: South East - Newport City Council
Start date: March 2015
End date: 2018
Cost: £13.7m
Design and Build contractors: Costain/Arup

We will register this project with the Considerate Constructors Scheme (external link) before construction begins.

Why we are doing it

We aim to increase the amount of traffic that can travel through these roundabouts, and so reduce delays on the M4, A48, A467 and the SDR. We also want to encourage more traffic to use the SDR. These improvements should also improve safety on these junctions.

Current progress

We have issued a letter of intent to our contractors. 

The Plan

Tredegar Park roundabout

The current plan is to enlarge and fully signalise the roundabout to the south. We also propose to build a route for traffic through the roundabout rather than round it.

Bassaleg roundabout

We will increase the capacity of the existing roundabout and provide full traffic signal control.

SDR Pont Ebbw roundabout

We currently plan to keep this roundabout mostly the same, but provide a road through the roundabout joining up the A48 SDR without needing to go around the roundabout. We would alter the existing traffic signals as a result of this.


Invitation to tender: July 2014
Award contract: January 2015
Approve preliminary design: July 2016
Approve detailed design: December 2016
Begin construction: March 2017
Complete construction:  July 2018
Opening ceremony: July 2018
End of defect correction period: July 2019

How we consulted

We consulted as part of the M4 Corridor Enhancement Measures consultations.

You can also find out about road closures, diversions, and project news by subscribing to Costain’s mailing list. Email Hannah Lewis to subscribe.