An 18-year-old Sandys parish man who sustained serious injuries in a road traffic accident on Sunday remains listed in critical condition in the Intensive Care Unit.Meanwhile, the appeal for witnesses to the single vehicle accident continues. The accident occurred on South Road in Southampton near the junction with Church Road around 5pm on Sunday.Anyone who may have seen the collision is urged to contact PC Gavin Richardson on 295-0011 to assist with police inquiries.