According to an eye-witness, six cars were involved in the incident on the Great Daux roundabout.
It was reported around 8.45pm on Saturday (August 29).
Police cars were pictured at the scene, with officers assisted by paramedics from South East Coast Ambulance Service.
A live traffic map, on Sunday morning, showed no delays in the area.
This article will be updated with more information, when it becomes available.
1. Horsham collision
A police car was pictured at the scene, after the collision, on the Great Daux roundabout. Photo: Sussex News and Pictures
2. Horsham collision
Six cars were reportedly involved in a collision, on the Great Daux roundabout. Photo: Sussex News and Pictures
3. Horsham collision
Six cars were reportedly involved in a collision, on the Great Daux roundabout. Photo: Sussex News and Pictures