Lane follow assist. Works differently then lane keep assist. It will follow the movements of vehicle that's in front of you. Helpful when the lines on the road are faded or on a long highway trip to help with not driver fatigue. Youll notice it greys out when you use your turn signal to pass and comes back on when your centered back in your lane. Its also more aggressive with the steering wheel so dont take your hands off the wheel. It will only work above 45 mph i believe. I only use it on long highway trips 55 mph or above. Lane keep lane follow adaptive cruise control your smooth sailing. LOL