Sussex Police said it was called to assist West Sussex Fire and Rescue Service after a collision on Rowlands Road shortly before 6pm.
Emergency services found a 'car on its side' and two people were 'mechanically trapped', police said.
They had been released from the vehicle by 6.40pm.
A police spokesperson confirmed a driver was arrested at the scene.
Vehicle recovery was still ongoing at 7.40pm but the road has since been cleared.
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