Hollywood star Mel Gibson walked away unharmed after losing control of his Maserati on a California road at the weekend.
Police reports show that he was not suspected of drink driving.
Officers attending the scene described the 54-year-old as "extremely co-operative" and a "gentlemen".
Patrol officer Leland Tang said: "At that location and on that road, it could have happened to anybody.
"For unknown reasons, Mr Gibson steered his car to the right and struck the rock hillside."
The Lethal Weapon actor was given a ride home by a friend after the vehicle was towed away.
Mel is involved in a bitter custody dispute with former girlfriend Oksana Grigorieva over their daughter Lucia.
She has accused him of assaulting her - an allegation being investigated by Los Angeles County Sheriff's Department.
Meanwhile, he alleges that she attempted to extort him.