The car suddenly rolled backwards and hit a traffic sign. The ankle twisted and hit the 17-year-old in the head. Since then she has been in mortal danger.

A day after the accident with a driverless car in Kassel, a 17-year-old is still in mortal danger. She had been sitting outside a restaurant and had been hit in the head by a torn traffic sign. Overall, her condition is now stable, the police said on Thursday.

The car rolled backwards on Wednesday for an unknown reason after the driver had parked it and got out. The car hit a traffic sign, which twisted and hit the young woman in the head. A 16-year-old from Göttingen, who was also sitting in front of the restaurant, was also injured in the head, but not as seriously. The driver was in shock.