It involved a grey BMW, a white Mercedes Benz and a black Toyota Yaris.
At 8.15pm on Saturday (6/10), there was a three vehicle collision on the A5 dual carriageway southbound, near Little Brickhill, Milton Keynes.
As a result of the collision, a 19-year-old woman sustained serious head and leg injuries and was taken to Milton Keynes University Hospital where she remains.
A 23-year-old man was also treated at the same hospital for shoulder and chest injuries, and discharged on the same day.
Investigating officer PC Neil Stephenson, of the Joint Operations Unit for Roads Policing at Milton Keynes, said: “This was a bad road traffic collision which resulted in the victims needing hospital treatment.
“We are appealing for anyone who may have seen this incident, or has dash-cam footage which captured it to contact police.”
Anyone with information should call 101 quoting 43180305861
