L2 = ACC w/ stop & go + lane centering. However, many details are hidden from the Ads/brochures. Examples:
Time interval for holding full stop w/o pushing ACC button;
Speed range for lane centering feature;
Whether the lane centering can be based on both lane markers and the car in front of you or lane markers only;
Whether it is hands free for stop/go traffic w/o warning;
Would be great to hear the experience of Tesla AutoPilot, Volvo PilotAssist, Toyota TSS2.0, and a bunch of other candidates.
Tesla AP blows everybody else out of the water in your list.the only thing that's comparable or even better than Tesla AP is Supercruise. However that's only available on the GT6 Cadillac and only works on divided highways. I keep hearing that Mobileye is working with OEMs to release L2+ (maps + localization) features on cars but haven't heard which cars are slated to use those features first.
For the curious, i drive a '11 camry