A car flipped onto its roof in a ditch on the Aytos–Burgas road, near the turn-off for Balgarovo. The driver, a young woman, was not hurt.
First reports say the woman lost control of her blue Fiat. It spun five times and came to rest upside down in the ditch.
Traffic police are at the scene working out how the crash happened. The cause is not officially known, and police have given no details yet.
It is not known whether the driver was tested for alcohol and drugs.