What can negatively affect the functioning of the lane keep assist system?

You answered correctly. The lane keep assist system relies on clearly visible and consistent road markings to detect lane boundaries. If weather conditions like heavy rain, fog, or snow reduce visibility, the system may not function properly. Similarly, if the road markings are worn out, faded, or unclear, the system cannot accurately identify the lane edges. Additionally, temporary or extra road markings at roadworks sites can confuse the system, as it may mistake these for regular lane lines. Understanding these factors helps ensure you can anticipate when the system might be less reliable and drive more cautiously.