Drivers heading towards the M4 near Cardiff are facing significant delays this morning as miles of congestion has built up along the approach roads.
Traffic is backing up considerably in the area, with queues stretching back for several miles and causing frustration for commuters and travellers trying to get moving.
Motoring groups are advising anyone planning to use the route to leave extra time or consider alternative roads where possible. The delays are affecting both local traffic and those trying to join the motorway network.
The M4 is one of Wales most heavily used roads, serving as the main artery connecting Cardiff to the rest of South Wales as well as linking into the wider UK motorway network through the Severn crossings. Any disruption on or near it tends to have a knock-on effect across a wide area of the region.
At peak commuter times the road can struggle to cope with demand, and incidents or even minor slowdowns can quickly snowball into lengthy tailbacks that take hours to clear.
Drivers are being urged to check live traffic updates before setting off and to stay patient if they are already caught in the queues. Traffic monitoring services are keeping a close eye on the situation as it develops throughout the day.
Local roads feeding into the M4 corridor are also seeing heavier than usual traffic as some drivers attempt to find alternative routes, which is adding to congestion across a broader area around the Welsh capital.
Anyone travelling in or around Cardiff today should factor in extra journey time and keep an eye on updates from Traffic Wales and other travel services for the latest information on how conditions are changing.