so i am driving at night with ACC activated. When i slow down using the button (say from 80mph to 60mph) - should the break lights be going on in order to alert the driver that's behind me? I noticed that sometimes they do, sometimes they don't, and even when they do, it's not instant. Same thing as when i drive with, say, 80mph and there's a big slope, the car holds onto that 80mph but break lights don't seem to be turning on. Is this how it is?