Drivers have been urged to avoid the A24 following a two car crash.
The A24 has been closed due to a crash between Buckbarn and Dial Post, West Sussex Fire and Rescue said.
In an updated statement, a Sussex Police spokesman said: “Two vehicles collided on the southbound A24 at Dial Post just before 4.15pm on Tuesday (8 October).
“One person was mechanically trapped and was being released.”
Traffic is heavy and emergency services are at the scene, according to the spokesman.
He added: “Drivers have been advised to avoid the area if possible for the time being.
“No further information is available at present.”