The collision, involving a black Nissan Juke and a cyclist, happened at about 3.09pm in Ramsey Road. The cyclist, a 13-year-old boy, was taken to Addenbrookes Hospital, in Cambridge, where he remains in a serious condition. Anyone with information about the incident is asked to call the Cambridgeshire, Bedfordshire and Hertfordshire Roads Policing Unit on 101, quoting incident 359 of March 24.