The white Mercedes AMG was travelling towards Bicester in the evening when it was involved in the collision with the red Citroën C4 heading in the opposite direction. Emergency services raced to the scene on the A41 between the junction with Creighton Road in Woodham and Kingswood just after the crash at 8.35pm on Friday, September 19. READ MORE: Pickpocket who 'targets vulnerable' detained in historic townThe driver of the Citroën, a 55-year-old woman, remains in a serious condition in hospital and Thames Valley Police has now put out an appeal for any witnesses. Officers are particularly keen to hear from a person walking along the A41 at the time of the crash. Lead investigating officer, DS Lyndsey Blackaby, of the serious collision investigation unit, said: “I am appealing for witnesses following this collision which has left a woman with serious injuries.