A 45-year-old man was pulled from his truck by two other men as he rested on the Westbound lay-by near the Fishbourne Roundabout.
The victim was disturbed at around 12:50pm on Thursday, June 13, when the suspects opened the drivers door, punched him and tried to pull him out of the truck.
However, the driver managed to fight back causing the suspects to run off and jump a fence running along side the A27.
PC Gareth Lownds from Chichester neighbourhood response team said: “Fortunately the driver was not seriously injured or had anything stolen from him or his lorry.
“However, he is nonetheless very shaken and I would appeal to anyone who witnessed the incident or knows who is responsible to please get in touch.
“You can call 101 quoting serial 641 of 13/6 or alternatively leave an anonymous message with the independent charity Crimestoppers on 0800 555 111.”