The incident happened at around 3.15pm on Sunday, May 28, and involved a black BMW 120d.
Emergency services attended and the driver of the car, a 19-year-old man, was taken to Ninewells Hospital in Dundee to be treated for serious injuries where he remains in a critical but stable condition.
The road was closed for around one hour and 50 minutes and re-opened around 5.05pm.
Sergeant David Farr said: “We are appealing for anyone with information that could assist with our crash investigation to get in touch.
“In particular, if you have dash-cam footage or were in the area and may have witnessed this incident, then please contact us.”
Anyone with information should call Police Scotland on 101, quoting incident number 2310 of May 28.
