Police Scotland is asking the public for help as enquiries into the incident, which occurred on the A714 near Wigtown, continue.
The force received a report of a crash involving a silver Renault Megane around 8.35 pm on Saturday, 27 June.
The 26-year-old driver, who was the vehicle’s sole occupant, was taken to Queen Elizabeth University Hospital by air ambulance.
He was treated for serious injuries.
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Road Policing Sergeant David Kerr said: “Our enquiries are ongoing and I am appealing for anyone who witnessed the crash or the vehicle prior, and who hasn’t already spoken to officers to get in touch.
“Additionally, I would appeal to anyone who was driving in the area and who may have dash cam footage which could assist to contact us.”
Anyone with information should contact the police and provide incident number 3292 of 27 June, 2026.
