A woman was seriously hurt after a coach, with around 70 people on board, crashed into a ditch on the A141 near March last week.
The woman, who is her 50s, had been taken to the Peterborough City Hospital with serious injuries following the incident, which happened at around 6.15am on Friday.
A total of 22 people were hurt in the crash, mostly minor injuries, and four were taken to the hospital for treatment.
The A141 was closed between Mill Hill Garage and Knights End Road. Motorists were advised to avoid the area or expect delays.
The Magpas Helimedix was called to the crash scene when Dr Zoe Smeed and Paramedic Chris Hawkins assessed the 22 patients, who were aged between 17 and 60-years-old, alongside the East of England Ambulance Service and HART crews.
These patients suffered a combination of head, chest and leg injuries, as well as headaches.
Two fire crews from March were also called to the scene and helped to assist with casualty care.
On Friday, police put out an appeal to trace a yellow bus which was seen in the area.
A spokesman said: “Following our appeal, the driver of the yellow bus seen in the area at the time of the collision has been in touch and is helping us with our enquiries.”
Police are still appealing for witnesses to the crash.
Anyone with information is asked to contact the road policing unit on 101. Alternatively call Crimestoppers, anonymously, on 0800 555 111.