You are using your motor vehicle’s lane keep assist system while driving. The system does not respond when you depart from the lane. What could be the cause of this?

You answered correctly. Lane keep assist systems depend on the vehicle’s sensors (like cameras) to detect lane markings and the edges of the road. If there isn’t enough light on the road, the system might not "see" the lane boundaries well. Similarly, heavy precipitation—like strong rain or snow—can obscure the cameras’ view or cover the markings. Finally, if there are no visible lane markings at all, the system cannot function since it has nothing to follow. All three situations can cause the system to stop responding. In practice, always be ready to take full control in such conditions and never rely solely on assistance systems.