The collision, between a Suzuki motorbike and a blue Mercedes CLK270, happened at about 8.15am along St Ives Road, Abbots Ripton. The driver of the motorbike, a man in his 30s, suffered life threatening injuries and was taken to Addenbrookes Hospital, in Cambridge, where he remains in a serious condition. The driver of the car, a woman in her 30s, was uninjured. PC Paul Gale from the Bedfordshire, Cambridgeshire and Hertfordshire Roads Policing Unit said: I would like to speak to anyone who saw either of the vehicles in the moments leading up to the collision. Anyone with information is asked to call 101, or Crimestoppers, anonymously on 0800 555 111.