M4 Westbound Closed: Delays

Motorists travelling on the M4 in south Wales are facing delays due to congestion on the westbound carriageway between junction 39 at Groes and junction 42 at Earlswood. The disruption began on 10 August 2026 at 16:33 and is expected to continue until 19:33 on the same day.

According to the Welsh Government, drivers can expect moderate delays on this stretch of the motorway, which is a major route connecting Cardiff and Newport with Bristol and London. The congestion is being managed by the Welsh Government, which advises motorists to plan their journeys in advance and to use alternative routes if possible.

Those using the M4 at this time are recommended to check traffic updates before setting out on their journey, and to use traffic apps or websites to plan the most efficient route. It's also a good idea to leave a little extra time to reach your destination, in case of any unexpected delays.

For those who must travel on the M4 during this time, the Welsh Government advises to anticipate delays and to consider leaving early to allow for extra time. The congestion is expected to ease once the disruption has ended and traffic returns to normal.

In the meantime, drivers are advised to exercise caution when using the motorway, as congestion can lead to reduced visibility and increased stopping distances. It's also a good idea to keep an eye on road signs and to follow the instructions of traffic management staff, who will be directing traffic around the affected area.

For the latest information on traffic and travel in Wales, including updates on the M4, motorists can visit Road Closures UK. The website provides up-to-date information on roadworks and traffic congestion, as well as advice on alternative routes and travel times.

Motorists are also advised to check for updates from the Welsh Government and other traffic information sources, such as the traffic radio and mobile apps, for the latest information on the M4 disruption. By staying informed and planning ahead, drivers can minimize the impact of the congestion and get to their destination safely and efficiently.