Cruise control

[Swallowtail]

As logger says, some confusion here...

Traditional Cruise control only has access to the accelerator, not the brakes.

Speed control like most interstate trucks have does both and will try and maintain a given speed both up hills and down hills.

Hill descent assistance (like my R36 has, not the 4WD down rocky mountain slopes type) will use the gearbox to downshift to attempt to keep the speed at the specified cruise control setting going down hills, but does not access the brakes, and is not related to ACC.

ACC is a whole world more clever, with the radar function in addition to speed control.

[NZTiguan]

Swallowtail's got it in one. I would add though that I have tried slipping the Tig into tiptronic and dropping down a gear (being careful NOT to touch the brakes) and it does increase the engine braking to help maintain speed, not perfect but as close as you can get with the current cruise control. Would have to say, with the diesel it needs a pretty steep hill before she runs away. My old Kia Sorento effectively put itself in "neutral" down hill and just "took off" unless you were on the brakes the whole time and the the Tiguan's transmission is much smarter than that !!

Cheers