A 35-year-old driver died after being involved in a crash where his silver BMW appeared to have struck a wall and left the road.
The incident, on the A915 between Upper Largo and Largoward in Fife, was reported to police at around 5am on Saturday.
He was taken to Victoria Hospital in Kirkcaldy, where he died later that morning.
The 24-year-old passenger of the car sustained serious injuries, which are not believed to be life-threatening, and was also taken to Victoria Hospital.
Sergeant Jim Henry said: “Our condolences go to the family and friends of the driver and we’re working to establish the full circumstances surrounding this collision.
“We’re asking anyone who believes they may have seen the car described in the area around this time, or anyone with information which can assist with our inquiries, to come forward.”
Meanwhile, a 23-year-old motorcyclist died following a collision with a hackney cab in Glasgow at around 11pm on Friday.
Gordon Lauder was riding a KTM off-road motorcycle on Skirsa Street towards its junction with Balmore Road, when he collided with the cab travelling north on Balmore Road.
He was taken to Glasgow Royal Infirmary where he died in the early hours of Saturday.
Police said the driver of the taxi and his two passengers were uninjured but have been left badly shaken by the incident.