Officers have said a "greasy road and possibly a heavy right foot" could have caused a car to overturn in Leeds.
West Yorkshire Police's Roads Policing Unit tweeted a picture of the silver vehicle flipped on its roof by the A1 in Boston Spa at around 3am this morning.
Nobody was injured in the accident, police said.
The force tweeted: "Boston Spa, greasy road and possibly a heavy right foot. Nobody injured."