Police are investigating a suspected hit-and-run incident after a woman was found seriously injured on a dual carriageway in Doncaster.
The 42-year-old woman was found in the middle of the inside lane of the A630 Trafford Way at its junction with French Gate at 2055 BST on Tuesday.
A witness told police he heard a collision and saw a dark-coloured car driving from the scene.
The woman suffered head injuries and was taken to hospital in Doncaster.
South Yorkshire Police appealed for witnesses.