Major M4 Road Closures and Disruptions in Wales - Week Ahead Alert! (2026)

Brace Yourself, Wales: Major Road Disruptions Ahead!

If you’re planning to hit the roads in Wales this week, you might want to rethink your route. From November 3 to November 9, several key routes—including the M4 and major A-roads—will face significant disruptions due to planned roadworks. Whether you’re commuting to work, heading out for a weekend getaway, or simply running errands, these closures and lane restrictions could throw a wrench in your plans. But here’s where it gets tricky: some of these closures are overnight, while others are during peak hours, leaving many drivers wondering, “When is the best time to travel?”

According to Traffic Wales South and the traffic monitoring system Inrix, the following roads will be affected. And this is the part most people miss: diversions will be in place, but they’re likely to add extra time to your journey, so planning ahead is absolutely crucial.

Here’s the full breakdown of what’s happening and when:

  • M4 Eastbound (J26 Malpas to J24 Coldra): Closed in both directions for resurfacing from November 3 to November 6, 8pm to 6am.
  • M4 Westbound (J24 Coldra to J26 Malpas): Closed for resurfacing from November 3 to November 5, 8pm to 6am.
  • M4 Westbound (J24 Coldra to J28 Tredegar Park): Closed for roadworks from November 3 to November 5, 8pm to 6am.
  • M4 Eastbound (J26 Malpas to J25A Grove Park): Closed for roadworks from November 5 to November 7, 8pm to 6am.
  • M4 Westbound (J27 High Cross onslip): Closed for roadworks from November 2 to November 3, 8pm to 6am.
  • M4 Eastbound (J28 Tredegar Park to J24 Coldra): Closed for roadworks from November 5 to November 7, 8pm to 6am.
  • M4 Eastbound (J42 Earlswood offslip): Closed for roadworks from November 4 to November 5, 7:30pm to 1am.
  • M48 Severn Bridge Eastbound: Closed for roadworks from November 3 (8pm) to November 4 (6am) between J2 and J1. Diversion via the M4 Prince of Wales Bridge.
  • A5 (Shropshire): Closed in both directions for roadworks from November 3 (8pm) to November 4 (6am) between Gledrid Roundabout and Halton Roundabout.
  • A55 (Conwy Westbound): Closed for roadworks from November 8 (7pm) to November 9 (7am) between J18 and J17. A contraflow will be in place eastbound from November 9 to November 11, 7am to 7pm.
  • A55 (Conwy Eastbound): Closed for roadworks from November 8 (7pm) to November 9 (7am) between J17 and J18. A contraflow will be in place westbound.
  • A40 (Carmarthenshire): Lane closures in both directions from 9:30am to 3:30pm, Mondays to Fridays, until November 7. Expect delays.

But here’s where it gets controversial: While these closures are necessary for long-term road improvements, many drivers are frustrated by the timing and frequency of these works. Are these disruptions truly unavoidable, or could better planning minimize the impact on commuters? Let us know your thoughts in the comments below.

For those who want to stay ahead of the chaos, signing up for the Wales Matters newsletter (https://www.walesonline.co.uk/newsletter-preference-centre/?view=Solus&mailingListId=8cdecf69-0a19-43af-8d50-ed4e2c52d045&utm_source=solusarticle) might be a lifesaver, offering daily updates on the biggest issues affecting the nation.

So, before you set off on your journey, take a moment to plan your route and allow extra time. After all, a little preparation now could save you a lot of frustration later. Safe travels!

Major M4 Road Closures and Disruptions in Wales - Week Ahead Alert! (2026)
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