Method for ascertaining an operating angle between a tractor and a trailer of the tractor

A method for ascertaining an operating angle between a tractor and a trailer of the tractor. The method includes: ascertaining camera images carried out in a chronologically consecutive manner with the aid of at least one rear-facing camera situated on the tractor; detecting structures of the trailer in the camera images; and ascertaining the operating angle by evaluating the detected structures in the camera image.