By far the best on the road.

Active Cruise Control with Stop & Go
function in the BMW X6.

Simply set your preferred cruising speed and relax: Active Cruise Control automatically reduces your speed up to a standstill if a slower vehicle appears in the lane ahead. If the vehicle is stationary for more than three seconds, a button must be touched before the vehicle will pull away. Even when Active Cruise Control is not in use, drivers can choose to have the system warn them if they are in danger of running into the back of the vehicle in front. Driving in slow-moving traffic becomes remarkably less tiresome.