A man in his 50s was taken to hospital this afternoon.
Police are investigating a collision between a pedestrian and a bin lorry on the A4074.
It happened at around midday and a man is now in hospital with serious injuries.
Officers say nobody else was injured in the incident and no arrests have been made.
Thames Valley Police Senior Investigating Officer Sergeant James Surman, who's based in Bicester, said: “We are investigating this collision in which a man has received serious injuries.
“We are appealing for the public’s assistance and would ask anyone with information or dash-cam footage to please get in touch."
Witnesses should call TVP on 101, quoting reference 0775 of 27/03/23.