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Can't wait for the ACC. I think that everyone needs to take responsibility for their own safety. It's like the tesla auto pilot system. There will always be those that abuse it and those that complain they think it isn't safe. Then there are those that use it the way it was meant to be used and never have an issue.
Pick your category.
After using the adaptive cruise with the 450 and close to 29k behind it, I LOVED it!
The biggest factor in deciding how safe it will be in my opinion will be the condition of the trailer brakes.
Adaptive cruise, unfortunately, doesn't know the condition of the roads.
I doubt anyone will disagree with me when I say such a system allows a driver to pay less attention, even with the best intentions. It lulls you into inattention.
The problem is that with serious weight behind you, you could hurt or kill many people. I have the system in our Lincoln. It works well enough, and can slow the car down seriously quickly if someone chops you. But you simply cannot slow down 30k very fast, or even 10k.