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Your fancy new car steers and brakes for you; so why keep your hands on the wheel?

SAN FRANCISCO — Right now on a busy stretch of highway somewhere, a driver is gazing out the window, hands on their lap, feet off the pedals.  Such driver-assisted motoring, a midpoint on the journey to fully self-driving cars, uses radar and cameras to help a car steer, brake and even change lanes. But as such features begin to emerge in less expensive cars, a vexing question looms: Automakers from Tesla to Nissan all caution that their tech must be monitored, but can humans be trusted to do so? “These systems are designed not only for ideal environments like good weather and clear lane markings, but also for rational behavior, and humans are predictably irrational,” says Bryan Reimer, a research scientist at the Massachuse ...