Police are appealing for witnesses to an assault which took place on the Link Road from the M3 Southbound to the M27 Westbound approaching Junction 4.
The incident took place between 7.20pm and 7.45pm on Monday 13 May.
It was reported to police that a confrontation took place between two people on the hard shoulder following a minor collision.
The people involved were a man in his 20s driving a black Audi TT, and a man driving a silver Peugeot 308.
During the incident, it is reported that the Peugeot driver leaned through the window of the Audi and assaulted the driver, causing injuries to his head and hands.
The Peugeot driver has been described as white, stocky, aged between 35 and 45, with brown hair, glasses and facial hair.
Police are appealing for anyone who witnessed the incident, or who can help us identify the driver of the Peugeot.
Anyone with information is asked to contact police on 101, quoting 44190164948, or call the charity Crimestoppers anonymously on 0800 555 111.