It works like any other start/stop but it appears to use the front sensor when in traffic. It may just be a coincidence but I tested it on my way to work this morning and 9 times out of ten it restarted when the car in front started to move off without me touching anything.
I know the system will restart the car itself under certain conditions and its done that too. It just seems to do it a hell of a lot when the car ahead begins to move.
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I don't have ACC and have noticed my Stop/Start cutting in as I slow down to stop, rather than once I've actually stopped. It's jumping in far more eagerly than my 280's ever did and I don't like it! Sometimes find it cuts in when I really don't want it to and can see this catching out the unwary or unfamiliar driver - tempted to deactivate it with my obd11 but do like the feature when it works properly in heavy traffic so have held off for now....