One lane of the A23 is closed because of a crash.
Traffic news said: "One lane closed due to accident on A23 Southbound between A273 (Pyecombe) and A27 (Patcham)."
A lorry has come off the road and gone into the embankment.
Sussex Police said: "Emergency services on scene. It happened at 7.50am."
Traffic is already starting to build up.