Cruise again

I would like to take up again the topic “Tempomat”: I drove with a C-Class a few days ago. There is the lever for the cruiser above the blinker. (also in need of getting used to, as I think, because we had already been snarled about our “turners”). But now it was the case that the operation of this part, not the one of the classic – known – cruiser, was defined, but actually only the top speed. So “Fuß vom Gas- and G And as soon as the set speed was reached, there was no more sprit. Now to my questions: – Is there this (special) function with our Volvos (now?) actually too? – I had asked here some time ago what the effect of cruise cars on fall distances looks like. Conclusion was at the time: speed can not be kept! Would that be for the Mercedes system a How does the cruise control reduce the speed when pressing the (-) button? Motor brake? Why couldn’t such a thing also work on falls? At least in the context of physics. I admit, some questions belong in the Benz forum, but I know you now and know that there are experts here.