The world has moved quickly from wonder at the idea of driverless cars to impatient expectation. The Cadillac SRX zipping around a test track in suburban Detroit is flashing a sign: Not so fast.
The car can pilot itself at highway speed while the person in the driver’s seat eats a hamburger.
Yet the first versions of General Motors Co. autonomous vehicles, due out by 2020, will drive themselves only on controlled-access highways, such as an interstate. Don’t count on them to avoid accidents on their own; it will be up to a licensed driver behind the wheel to avoid the deer running out from the roadside. The reasons are
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