Several roads in Wales are shut or partially blocked on Sunday, May 18 – here is a full list of closures you need to know about

09:01, 18 May 2025Updated 09:29, 18 May 2025

Roadworks on a road in Wales There are a number of routes impacted by roadworks across Wales on Sunday (Image: John Myers)

A number of main roads across Wales are closed or partly closed on Sunday, May 18, due to planned roadworks.

As of time of publication on Sunday morning there were no major issues or new incidents affecting the M4 in south Wales or the A40, A470 or A48. A section of the A55 in north Wales is temporarily blocked due to animals on the road, and one lane of the Prince of Wales Bridge is shut due to ongoing resurfacing work.

Elsewhere, there are other roads in both south and north Wales affected by roadworks which will have an impact on journey times throughout Sunday. Meanwhile, filming is taking place in Cardiff city centre, with three road closures in place. For our free daily briefing on the biggest issues facing the nation, sign up to the Wales Matters newsletter here.

Below is a list of road closures and part closures/disruptions affecting roads in Wales on Sunday (according to traffic monitoring service Inrix):

  • Cardiff city centre – Scott Road, Park Street, Havelock Street, all closed between 6am and 8pm due to filming.
  • M4 PRINCE OF WALES BRIDGE – MONMOUTHSHIRE – BOTH DIRECTIONS – BRISTOL – One lane closed due to resurfacing work and contraflow on M4 Prince of Wales Bridge in both directions between J22 M49 and M4 J23 / M48. One lane shut on each side with Wales-bound traffic running through a contraflow. There will be some overnight closures. Until 30th May.
  • A534 HOLT ROAD – BORRAS – EASTBOUND – WREXHAM – A534 Holt Road Eastbound closed due to roadworks from Rydal Court to B5100 Dean Road. Until 6th May 2026.
  • A465 HEADS OF THE VALLEYS ROAD – MERTHYR TYDFIL – Lane closed due to long-term roadworks on A465 Heads Of The Valleys Road at High Street (Dowlais Top Roundabout). Expect delays. Until 24th July.
  • A465 HEADS OF THE VALLEYS ROAD – RHONDDA CYNON TAFF – BOTH DIRECTIONS – RHONDDA, CYNON, TAFF – Narrow lanes and speed restriction of 40 mph due to long-term roadworks on A465 Heads Of The Valleys Road in both directions from A4061 Rhigos Road (Rhigos Roundabout) to High Street (Dowlais Top Roundabout). Expect delays.
  • A525 – GREEN – DENBIGHSHIRE – Temporary traffic lights due to electricity work on A525 between A543 Rhyl Road and Capel y Green church. Until 3rd June.
  • A5 LONDON ROAD – VALLEY – ISLE OF ANGLESEY – Temporary traffic lights due to electricity work on A5 London Road between Gorad Road (Valley) and A5153 (Tesco roundabout, Holyhead). Expect delays. Until 6th June.
  • A484 – GLANGWILI – CARMARTHENSHIRE – Temporary traffic lights due to roadworks on A484 between Pantglas (Glangwili) and B4301 (Bronwydd Arms). Expect delays. Until 30th June.
  • A5 – FRONCYSYLLTE – WREXHAM – Temporary traffic lights due to roadworks on A5 at B5434 Gate Road. Expect delays. Until 23rd May.
  • A5 MENAI BRIDGE – MENAI BRIDGE – GWYNEDD – Temporary traffic lights due to long-term roadworks on A5 Menai Bridge between A487 Treborth Road (Antelope Roundabout) and A545 Telford Road. Expect delays. Until 31st December.
  • A40 BEAUFORT STREET – CRICKHOWELL – POWYS – Temporary traffic lights due to roadworks on A40 Beaufort Street at Standard Street. Expect delays. Until 30th May.
  • A490 – CHIRBURY – BOTH DIRECTIONS – SHROPSHIRE – Temporary traffic lights due to roadworks on A490 in both directions near The Country Border. Until 31st May 2025.
  • B4312 OLD ST CLEARS ROAD – JOHNSTOWN – WESTBOUND – CARMARTHENSHIRE – Old St Clears Road Westbound closed due to roadworks from Job’s Well Road to Millbank Road. Until 4th March 2026.
  • B5429 – BODFARI – BOTH DIRECTIONS – DENBIGHSHIRE – B5429 in both directions closed due to roadworks from Ffynnon Y Chwarel (Bodfari) to Heol-Y-Brenin (Tremeirchion). Until 23rd October 2025.
  • B5605 PARK ROAD – PENTRE – WREXHAM – Park Road closed due to roadworks from A5 to The Newbridge Arms. Until 24th July 2025.
  • THE A487 – TRE-R-DDOL – CEREDIGION – Temporary traffic lights due to roadworks on The A487 between Tre’r ddol (Tre-R-Ddol) and Furnace (Furnace). Expect delays. Until 31st March 2026.
  • THE A488 – PLOXGREEN – BOTH DIRECTIONS – SHROPSHIRE – Temporary traffic lights due to roadworks on The A488 in both directions between Ploxgreen (Ploxgreen) and Hope (Hope). Until 23rd May.
  • THE A4093 – BRYN GOLAU – BOTH DIRECTIONS – RHONDDA, CYNON, TAFF – Temporary traffic lights due to water main work on The A4093 in both directions at The B4278 / Mountain View. Until 30th November 2025.