A racing driver, cleared of killing a woman, is calling for checks to make sure drivers involved in race track crashes are fit to take to the road.
James Sutton, 21, was found not guilty of causing death by dangerous driving following a high speed crash on the A45 near Daventry, Northants, in 2005.
Angela Martin, 55, of Banbury, Oxon, died when the car she was a passenger in collided with Mr Sutton's vehicle.
Mr Sutton, who said he blacked out, had previously been in a race track crash.
Jurors at Northampton Crown Court took just over four hours to acquit him of causing death by dangerous driving on Tuesday.
Mr Sutton said he was suffering from automatism, which left him physically but not mentally in control of his car, in the moments before the crash.
The day before the accident he had been test driving at the Oulton Park circuit in Cheshire, where he span off the track and hit a concrete wall, injuring his neck and spine.
Mr Sutton was given the all-clear by medical staff, who found no sign of brain injury or trauma.
The semi-professional racing driver told BBC News: "These sort of accidents can be caused by injuries from the day or however many times before so I think new guidelines do have to be introduced."