ACC helps reduce driver fatigue on long trips and when driving in traffic. The system uses millimetre-wave radar and a monocular camera to measure the distance to the vehicle ahead, accelerating or decelerating as needed to maintain the distance you have set. (You can choose from four distance settings.) If the road ahead is clear, it will maintain the speed at which you were travelling when you engaged the system. ACC can be linked to the traffic sign recognition system through the driver customisation setting. ACC set speed will be adjusted based on the posted speed limit.