To get their cars to stay in lane or follow traffic by themselves, automakers are adding more sophisticated and pricey sensors and software to their vehicles. But not all of them are pointed at the road.
Systems like Tesla Autopilot, GM’s Super Cruise, and Nissan’s ProPilot Assist can automatically follow traffic and even drive hands-free on highways but need drivers to be ready to take over from the supposedly smart software at any moment. To guarantee drivers aren’t napping, Snapchatting, or Candy Crushing when they’re using these advanced driver-assistance features, automakers have rolled out a second layer of technology called driver-monitoring systems. Their job is to look for signs that a human—notoriously unpredictable as they
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