7 days ago
Major M4 and other road closures in Wales today, Sunday, August 3
Several major roads across Wales are shut or partly shut on Sunday, August 3, due to planned roadworks.
Roads affected include busy routes such as the M4, A40, and the A470 but other A-roads across parts of Wales are also affected, so it's worth keeping an eye on any alternative routes that might make your journey easier. For our free daily briefing on the biggest issues facing the nation, sign up to the Wales Matters newsletter here.
Below is a full list of scheduled road closures and part closures/disruptions affecting roads in Wales on Sunday (according to traffic monitoring service Inrix):
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M4 Eastbound J32 Coryton to J30 Cardiff Gate will be closed overnight from 8pm, to 6am on Sunday, as resurfacing work continues. The usual diversion will be in place via the A4054, and these works are expected to be complete by August 21.
M4 - BRIDGEND - BOTH DIRECTIONS: Two lanes closed and narrow lanes due to roadworks on M4 in both directions between J37 A4229 (Pyle / Porthcawl) and J38 A48 (Margam). Until 30th November.
A541 - MOLD - EASTBOUND - FLINTSHIRE: A541 Eastbound closed due to gas main work from A541 (Tesco roundabout) to A494 (Wylfa roundabout). Until 8th August.
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 December 31.
A483 - GARTHMYL - BOTH DIRECTIONS - POWYS: Temporary traffic lights due to roadworks on A483 in both directions at the B4385. Until 5th August.
A40 - MONMOUTH - BOTH DIRECTIONS: Contraflow and roadworks on A40 in both directions between A466 Dixton Road (Dixton Roundabout, Monmouth) and B4164 / Norton Close (Whitchurch). Expect 22nd August.
A470 Southbound - Abercynon to Pontypridd: To close overnight from 8pm, to 6am on Sunday, as resurfacing work continues. Diversions will be in place and these works are expected to be complete by August 16.
A473 PARK STREET - BRIDGEND: Temporary traffic lights due to gas main work on A473 Park Street at St Leonard's Road. Expect delays. Until 3rd October.
THE A483 - GARTHMYL - BOTH DIRECTIONS - POWYS: Temporary traffic lights due to roadworks on A483 in both directions at the B4385. Until 5th August.
A484 SANDY ROAD - LLANELLI - CARMARTHENSHIRE: Temporary traffic lights due to roadworks on A484 Sandy Road at Maesycoed. Expect delays. Until 29th August.
THE A488 - HOPE - BOTH DIRECTIONS - SHROPSHIRE: Temporary traffic lights due to emergency repairs and roadworks on The A488 in both directions near Hope. Until September 1.
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 March 31, 2026.
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 November 30, 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 March 4 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 October 23, 2025.
