Photos have been sent to this newspaper showing a van on its side with a fire engine, police cars and ambulances at the scene.
AA Traffic News at www.theaa.com/route-planner/traffic-news said the incident was first reported at 11am.
The note on the live map said: “Road blocked and queueing traffic due to accident, a van and a car involved on A23 Southbound after B2118 Mill Lane (Hurstpierpoint / Sayers Common Turn Off). Congestion to Hickstead.”
As of 12.45pm, the AA’s live map shows traffic at a standstill from the Albourne area to the Hickstead area.
Sussex Police have been approached for information.
1. A23 collision
Emergency services at the scene of a collision on the A23 on Saturday, October 24. Photo: Eddie Mitchell Photo: Eddie Mitchell
2. A23 collision
Emergency services at the scene of a collision on the A23 on Saturday, October 24. Photo: Eddie Mitchell Photo: Eddie Mitchell
3. A23 collision
Emergency services at the scene of a collision on the A23 on Saturday, October 24. Photo: Eddie Mitchell Photo: Eddie Mitchell
4. A23 collision
Emergency services at the scene of a collision on the A23 on Saturday, October 24. Photo: Eddie Mitchell Photo: Eddie Mitchell