Police are still seeking witnesses to an accident on South Road that left a 19-year-old in critical condition.The Pembroke teenager was injured at around 3.30pm on Monday near the junction with Devon Heights Road in Devonshire after he collided with a truck.As of yesterday afternoon, the teenager remained in critical condition in the intensive care unit at the King Edward VII Memorial.Any witnesses who have not come forward already, especially the occupant(s) of a grey Honda SUV that was apparently in a line of traffic behind the truck involved, are encouraged to contact Pc Walter Jackson at the Roads Policing Unit on 247-1230