A 70-year-old man has been killed in a crash on the M4 in Neath Port Talbot.
The motorcyclist died at the scene between junction 43, for Llandarcy, and 44, for Llansamlet.
The westbound carriageway remains closed between junctions 42 and 44 following the crash at about 16:25 BST, to allow investigations to continue.
Earlier, tailbacks had stretched back six miles, with roads into Swansea and Neath also affected, but the congestion has now cleared.
Motorists are still advised to avoid the area, with diversions are in place along the A4230 through Skewen and the A465 past Neath.
The motorway expected to remain closed for a “significant period” of time, Traffic Wales said.