ProPILOT is activated by pressing a button on the steering wheel near the regular cruise controls. Cruise control is then activated in the normal way, setting a desired top speed and allowing the sensors to keep the vehicle paced with the vehicle in front of it. The ProPILOT system adds the ability to sense the lane’s edges and help hold the car in the center of those lines. This is done through a forward-facing camera, which sees the lane markers and instructs the vehicle’s steering system to keep it centered between them. The driver, of course, can override at any time. Finally, if traffic stops completely, the ProPILOT Assist system will stop the car. If the stop lasts more than three seconds, the driver must input through either a button press or on the accelerator to resume the car’s movement.