The victim, a 46-year-old man from Andover, had pulled into a layby at around 7am with another vehicle before being assaulted by the driver.
He suffered injuries to his legs and face as a result.
A 26-year-old man was arrested on suspicion of assault occasioning actual bodily harm, he has been released from custody but remains under investigation.
Officers investigating have made a number of enquiries and are now asking you for help.
Were you on the road at the time? Perhaps you saw two men in a layby on the A3093?
Anyone with information, or dash-cam footage, is asked to phone 101 with the reference 44200370483.
Alternatively, you can call Crimestoppers 100% anonymously on 0800 555 111.