If I'm on a road trip with somebody, and they're driving, I expect to be able to sleep in the passenger seat. “Full” implies that level of competence, which includes knowing its own limitations and therefore when to pull over.

I can think of half a dozen terms off the top of my head that would better describe what its doing, but they aren't quite as punchy, and critically, they won't give the impression that the car is capable of functioning without oversight. Being able to obliquely claim-without-claiming is very much the point of the current terminology.

   * trip control
   * trip assist
   * co-pilot
   * auto steer and throttle
   * partial self-driving (i.e., what it's actually doing!)
   * hands-free steering