The AA was reported that the A24, Worthing Road, northbound, was closed and there is slow traffic due from the B2133 in Ashington to the B2135 Steyning Road in West Grinstead.
The crash was reported at 12pm with emergency services called to the scene of the incident.
The road was subsequently reopened at 3.29pm.
1. Section of A24 in West Sussex closed following crash
A section of the A24 in West Sussex has been closed following a crash. Picture: Eddie Mitchell Photo: Eddie Mitchell