Police were called at 5pm on Friday (July 27) to Sompting Road at the junction with Leigh Road in Worthing where a member of the public has seen a man and woman arguing in a car.
The man was seen to push the woman across into the passenger seat and he then got into the car and drove off towards the A27.
Police are appealing for witnesses to anyone who saw a small red R registration car driven by a woman between 18 to 24, white with dark hair or a black man between 20 and 25.
Detective Inspector Sarah Barrett said: “This could be entirely innocent but we would like to speak to anyone who saw the car or the people involved. If you have any information, please contact police on 101 quoting serial 1485 of 27/7.”