A 57-year-old bus driver was arrested after crashing his bus into a jogger on Porters Park Drive, Shenley, at around 7.20am on August 30.
A helicopter ambulance flew to the scene and took the 50-year-old victim, still in a critical condition at the time of writing, to hospital.
The bus driver has since been released on bail as enquiries into the accident continue.
PC Peter Hoddy, from the serious collision investigation unit, said: “Following the events of Wednesday morning, we are continuing with our investigation, and we are appealing to anyone who witnessed the collision or has information to come forward.
“We particularly want to hear from the lady who was on the bus at the time of the incident as she may have vital information to assist with our enquiries.”
Anyone with information is asked to please email email@example.com