On Honda I know they do come on if the system is actually braking. If it is just letting off the throttle, they don't come one. So similar to if I was the one doing the slowing down.
I do agree with puffnstuff in that they do have a time and a place. Driving on a busy interstate in Arizona with traffic constantly flowing between 55-75 mph, it was great to be able to set it and forget it.
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