hereGreater Manchester Police are keen to speak to anyone who may have witnessed the collision.A red Audi TT and a white van stopped at the scene to assist the victim.Police officers would like to speak to people inside both vehicles as part of their enquiries.Police Constable Chris Haxby, of GMP’s Roads Policing Unit, said: "While this collision resulted in an elderly man suffering serious injuries, it is fortunate that this incident was not any more life-threatening."The victim was unstably