A system includes at least one electronic control unit, which performs a method including consecutively or simultaneously, determining a future turning maneuver of the ego vehicle, detecting information relating to the lane markings and the number of available lanes in the environment in front of and next to the ego vehicle, and determining whether at least one further road user is in a relevant lane next to or behind the lane of the ego vehicle. If so, a future intended movement of the road user is determined from the information relating to the lane markings and the number of available lanes. And if it is determined that the ego-vehicle and the road user are on an at least two-lane turning lane, or that the road user stops before the turning maneuver of the ego-vehicle or leaves its lane, it is determined that there is no probability of a collision.