Police are appealing for witnesses following a three-vehicle crash which closed part of the A259 for several hours.
A black BMW C330 collided with a silver Kia Sportage and a red Ford Focus, before colliding with a chain link fence close to the junction with Church Road in Portslade, about 12.54pm on Wednesday (8 May).
Three further vehicles were also damaged as a result of flying debris.
Members of the public detained a 23-year-old man until police arrived at the scene, and he was arrested on suspicion of dangerous driving.
The suspect was taken to Royal Sussex County Hospital as a precaution, where he was seen for minor injuries. Four other people also reported minor injuries.
The man was later de-arrested and detained under the Mental Health Act, but remains under investigation in connection with the incident.
Police would like to hear from any witnesses, anyone with dash cam or CCTV of the incident, or anyone who saw the BMW travelling eastbound from Shoreham to Fishersgate prior to the collision.
You can email email@example.com or call 101, quoting serial 484 of 08/05.
A section of the road was closed until about 6.55pm while forensics investigations were carried out at the scene.