A millimeter-wave radar sensor allows the available Dynamic Radar Cruise Control  to help maintain your selected speed. This system also enables you to follow the vehicle in front of you at the same pre-set speed. If you get too close to the traffic in front of you, the throttle is automatically reduced and brakes are applied. Once the road clears, the IS C returns to its pre-set speed. A car icon on the information display shows the selected following distance.