Commuters are facing long delays on the M4 following a crash on the motorway.
It happened at Junction 23 going westbound near Magor Services.
Cameras in the area show vehicles queuing along the carriageway.
Traffic Wales say congestion between Junction 22 and 23 is "severe" but should be clear by 6:30pm.
Commuters had already been warned to take care when driving due to poor weather conditions caused by Storm Brendan.