The incident between a silver Citroen Picasso and a Ford Focus happened at around 1.45pm on the stretch of road between Godmanchester and Offord Cluny. A spokesman for Cambridgeshire Fire and Rescue said: One vehicle had left the roadway landing on its side in a ditch. The East Anglian Air Ambulance was called to the incident and landed in a field next to the scene to treat the man, who was trapped in his car in a ditch, for arm and leg injuries. A spokesman from the air ambulance said: The crew provided advanced care at the scene and sedated the patient before escorting him to Addenbrookes Hospital by land ambulance. The spokesman added that the man remains in a serious but stable condition.