**Extensive Road Closures Announced Across Wales Today: Motorists Advised to Plan Ahead**
Motorists travelling in and around Wales today, Sunday, 3 August 2025, are being urged to check their routes in advance, as multiple major roads – including the M4, A40, and A470 – are facing significant closures and partial blockages due to ongoing and planned engineering work.
The updates, provided by regional authorities and traffic monitoring services such as Inrix, detail a host of works impacting commuter belts and key arterial routes throughout the country. These disruptions are part of a wider effort to upgrade infrastructure, but for those journeying this weekend, they pose considerable potential for delays.
Among the most notable works, the M4 Eastbound will be closed between Junction 32 (Coryton) and Junction 30 (Cardiff Gate) from 8pm until 6am on Sunday as resurfacing continues. A diversion route will lead motorists via the A4054, with the works anticipated to last until 21 August. Travellers are advised to factor in additional time if using this stretch, especially given it is a primary link between the Welsh capital and the Valleys.
Further west, the M4 in Bridgend is affected in both directions with two lanes closed and the carriageway narrowed between Junction 37 (Pyle/Porthcawl) and Junction 38 (Margam). This disruption is scheduled to persist until the end of November, with ongoing works expected to extend commute times for regular users.
North Wales also sees critical works underway. On the A541 Eastbound in Mold, Flintshire, a section between the Tesco roundabout and A494 Wylfa roundabout remains closed for essential gas main repairs, with completion slated for 8 August. Road users have been encountering diversions and are advised to check local signage.
The iconic A5 Menai Bridge, a vital crossing into Gwynedd, is operating under temporary traffic lights between A487 Treborth Road (Antelope Roundabout) and A545 Telford Road. Persistent long-term roadworks are forecast to create bottlenecks and extended delays, and this situation is set to continue through to the end of the year.
Other prominent routes facing similar challenges include the A483 at Garthmyl in Powys, where work at the B4385 junction is marked by temporary traffic lights, continuing until 5 August. Meanwhile, in Monmouth, the A40 is affected by a contraflow and ongoing works between the Dixton Road roundabout and Whitchurch, likely to cause interruptions for through-traffic until 22 August.
South Wales commuters on the A470 heading towards Pontypridd will confront overnight closures starting at 8pm and running until 6am as resurfacing projects progress, with completion anticipated by 16 August. Diversion signs will guide drivers along alternative routes during these night-time works.
A swathe of other roads, including the A473 Park Street in Bridgend, A484 Sandy Road in Llanelli, and A487 between Tre’r-ddol and Furnace, are subject to temporary traffic lights and continued works scheduled for the coming weeks and months. Some, like the A487, are not expected to wrap up until March 2026, signalling long-term disruption.
These closures present a recurring challenge for Welsh road users during the summer season, especially as ongoing repairs and infrastructure enhancements coincide with busy travel periods. Authorities stress the importance of keeping informed via official updates and recommend planning journeys outside of peak times wherever possible.
For those who can, alternative means of transport such as public transit may offer respite from the roadworks, although many communities will have limited options. As the Welsh Government and local councils push forward with these upgrades, motorists are being reminded that patience and preparation will be essential for navigating the network in the weeks ahead.
For further travel updates or the latest planned closures, drivers can consult government sources, traffic-monitoring apps, or subscribe to travel newsletters to stay updated on ongoing projects and new developments.