Bryant Walker Smith: By automating driving, cars may someday be able to be lighter, smaller, use less space, travel closer together, generally use the existing roadway infrastructure more efficiently. Now that's very long-term. In the short term, we may actually see something very different, which is self-driving cars behaving more cautiously, keeping more space, taking longer at stop signs. Read more about Nevada Gives the Green Light to Google's Driverless Cars
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