After years of sunny optimism and big promises,  automakers are beginning to realize just how difficult it is to make a  market-ready, full self-driving car. The CEO of Volkswagen's autonomous  driving division recently admitted that Level 5 autonomy—that's full computer control of the vehicle with zero limitations—might actually never happen.
A quick primer on the now-industry-standard SAE International rules on  how to discuss self-driving abilities: Level 0 is no automation  whatsoever. Level 1 is partial assistance with certain aspects of  driving, like lane keep assist or adaptive cruise control. Level 2 is a  step up to systems that can take control of the vehicle in certain  situations, like Tesla's Autopilot or Cadillac's Super Cruise, while  still requiring the driver to pay attention.
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