M4 delays ease after 32 miles of stop-start traffic
A rugby final at Cardiff's Arms Park ground was partly the cause of 32 miles (50 km) of stop-start traffic on the westbound M4, traffic officials said.
Drivers were delayed from Bath's junction 18 to Newport's junction 26, according to Traffic Wales.
It said rugby fans heading for Cardiff to see Bath and Northampton Saints in the Amlin Challenge Cup and the bank holiday getaway were both factors.
The delays had cleared around the time of the game's 20:00 BST kick-off.
But motorists still faced delays of up to 30 minutes with heavier traffic than usual at the tolls on the Second Severn Crossing, Traffic Wales said.
Drivers approaching Cardiff earlier also had to cope with downpours as well as an earlier accident on the westbound A48 near Newport.