The M4 is currently closed in both directions due to an overturned animal trailer near Swansea.
Both lanes are closed between Junction 45 Ynysforgan to Junction 46 Llangyfelach according to Traffic Wales.
Police were called to the M4 at approximately 6.20am following reports of a road traffic collision.
The collision involved 4 vehicles but no-one has been seriously hurt.
Drivers are being told to expect long delays as the cattle are removed from the carriageway.