How can people safely take control from a self-driving car?

New cars that can steer and brake themselves risk lulling people in the driver’s seat into a false sense of security — and even to sleep. One way to keep people alert may be providing distractions that are now illegal. That was one surprising finding when researchers put Stanford University students in a simulated self-driving car to study how they reacted when their robo-chauffer needed help. The experiment was one in a growing number that assesses how cars can safely…