It's interesting to compare all that with my now almost-four-years-old Volvo (how time flies!).
That definitely has ACC that works seamlessly from 0 to maximum speed and it cuts out after a few seconds at rest but just keeps the brakes on so doesn't creep. I think if you just left it like that it would eventually shout at the driver to take some action. If a jam moves off after after a delay you can either tickle the accelerator pedal or push the resume button.
I think it's just a single radar but there's definitely some integration with the camera (reads road signs etc.) parking sensors and blind-spot sensors. It also senses pedestrians and cyclists (not sure how) but I think that's only at lower (non-motorway) speeds. It's not brilliant at working out what to do when a vehicle pulls into the gap between you and whatever you're following though.
The lane warning/control (can be switched off separately) is fairly gentle and isn't designed to keep you in lane, though it has a go and works on gentler curves. And if you try to pull sideways into a vehicle in your blind spot it gets pretty firm!
I suspect that it actually has a bunch of separate systems with some information-sharing from sensors.
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions, ski hatch retrofit; extended leather. Aftermarket DVB-T, reversing camera and full XCarlink (Bluetooth etc.).
2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation".  (A much rarer model than a D2 S8 by the way!) Oh, and a brand new engine at just under 30,000 miles on the factory one! 
Finally: gone, but not forgotten.....
1998 D2 PF S8. AgateGrey/Platinum. Every option (I think) except electric rear seats, tiptronic steering wheel, ski hatch, towbar & dimming door mirrors.
e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course.  (internal dimming mirror added later)
1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon, Auto-dim mirror, Leather, Trip computer, Cruise control, OEM Ford SatNav with CD changer.
And before that a lot of Rover 800s, a few oddities, a lovely Triumph Dolomite 1850HL with Overdrive and way back in my schooldays an Austin Seven aka Mini 850!
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