The Magpas air ambulance and paramedics from the East of England Ambulance Service were called at about 11.30am to a stretch of the road between Caxton Gibbet and Cambourne following reports that a car and a motorbike had collided. A spokesman for Magpas said: The Magpas medical team assessed the man in his 50s who had sustained serious leg injuries. The patient was sedated and given strong pain relief and measures put in place to protect his injuries. The team then accompanied him by land ambulance to Addenbrookes Hospital, where he was in a serious condition upon arrival. It was the second collision involving a motorcycle and a car attended by the air ambulance in less than a week, following an incident on May 17 i on the same stretch of road. A spokesman for Cambridgeshire Fire and Rescue Service said one crew from Papworth and a crew from St Neots were called to attend the incident. The spokesman said: Firefighters arrived to find a collision on the eastbound carriageway, between Caxton Gibbet and Cambourne, involving two vehicles. Using specialist cutting equipment they released two casualties who were left in the care of ambulance crews. The crews returned to their stations by 1.50pm.