Three things available from BMW:

- Active cruise control: As described by LeMansX5 above, ie. radar detector that senses the distance in front of the car and adapts (accelerates/brakes) in order to maintain the sepcified distance. Not availabel as an option to X5 according to my knowledge.

- Cruise control with brake function: Presets speed, that in case it is lower than the actual, it brakes the vehicle to achieve that speed. ie. you set at a 100, you drive/overpass so you reach at 120, recall the preset speed and the vehicle brakes. Std. cruise control option for the 4.8X5.

- Std. Cruise control: As normal and without the brake function. Available in other BMW models and past X5 (E53).