Simranjit Kajla, 28, is accused of attempting to kill Thames Valley Police officer Christopher Miller (pictured) following the incident in Stoke Poges, Buckinghamshire on May 22.
The 38-year-old sustained 'life-threatening injuries' on Thursday at around 10.20pm on the B416 Bells Hill, between Decies Way and Rogers Lane in Stoke Poges, Buckinghamshire.