A temporary contraflow will be introduced for the Gibraltar Tunnels from next week.
The tunnels will be down to one carriageway for two nights from next Monday between 7pm and 6am.
Traffic Wales said a contraflow agreement will be in place to carry out maintenance and survey works in both tunnels.
Person found dead on railway track
A person has been found dead on the railway tracks at Abergavenny railway station.
Strike at Abergavenny King Henry School parents react
School staff who teach children with additional learning needs have returned to work despite ongoing industrial action.
Teachers strike continues at Abergavenny school
A second teachers strike at a school grappling with a deficit of more than £2 million is due to take place this week.
Eight-figure sum quoted to fix Ledbury station access
A long-standing problem at a Herefordshire railway station could cost £10 million to put right.
Relief road pledge could put five proposed rail stations at risk
Promises to revive the abandoned M4 relief road pose a threat to confirmed plans for five new rail stations in and around Newport.
Light rain shower
High: 12°C | Low: 1°C
Light rain shower
High: 11°C | Low: 1°C
Sunny intervals
High: 11°C | Low: 1°C
