One lane was closed after an accident on the A27 Shoreham By Pass this afternoon (Saturday), according to traffic reports.
Queuing traffic was reported eastbound from A283 Steyning Road to A270 Upper Shoreham Road (Southwick / Holmbush turn off).
According to an eye witness, police officers and ambulances are were on the scene.
A Sussex Police spokesman confirmed it was a two-vehicle collision.
He added: "A vehicle had broken down and it was rear-ended by a car behind.
"There were no reported injuries."
The road was cleared by 5pm.