Like trying to steer a car by looking in the rearview mirror, they hold hearings to figure out what went wrong and then write new laws based on old facts.

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Another system uses cameras to detect when the car begins to drift, emits a warning and can automatically steer the car back into the lane.

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Though the kids sit in the driver's seat and even steer the car sideways, a hidden rail underneath always guides them back to the middle.

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Determining when to wait behind another car in traffic and when to steer around a stalled vehicle is just the sort of subtle problem that DARPA aims to solve in its robotics competitions.

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It does not mean leaving pilots completely free to steer their own course like car drivers, but it does transfer more responsibility for plotting a route and following it to the pilot, with the ground controller keeping an eye on things.

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And as long as you don't lift off the throttle in a bend, the car will stay put and, at worst, under-steer slightly right near the edge of sane driving speeds.

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