Helps maintain a constant vehicle speed and a set following interval behind a vehicle detected ahead of yours . When the vehicle ahead changes speed, ACC senses the change and accelerates or decelerates to maintain a set interval. and, if the detected vehicle comes to a stop, can decelerate and stop your vehicle, without you having to keep your foot on the brake or the accelerator. When ACC with Low Speed Follow slows your vehicle by applying the brakes, your vehicle's brake lights will illuminate.