Steep hills always pose a challenge, which is why the Gx employs a highly evolved technology called Downhill Assist Control (DAC). When descending steep grades, one touch of a button instructs DAC to administer braking as needed to help maintain an even speed of descent. All you need to do is steer. The Gx is also equipped with Hill-start Assist Control (HAC). HAC helps control the Gx from rollback during that brief moment when your foot travels from brake to accelerator before beginning an ascent.