The present invention relates to a method for controlling an electrical power collector (70) configured to collect electrical power from a track line (30) of an electric road system arranged along a road (10). The track line (30) comprising activatable light indicators (40) arranged on the track line (30). The electrical power collector (70) being mounted on a vehicle (20). The method comprising, while the vehicle (20) is driving, capturing, using a camera (60) mounted on the vehicle (20), a video stream depicting the track line (30), identifying active light indicators in the captured video stream, and upon identification of active light indicators (40), activating the electrical power collector (70) such that a sliding contact (50) of the electrical power collector (70) makes sliding contact with the track line (30). Also a control circuit and a control system is presented.