It's a sunny morning at Sonoma Raceway, north of San Francisco-a great day for a race. My driver, Robby, pulls up to greet me. Robby is not a person. It's a car-an autonomous racecar, to be precise-and it's ready for a fight. Outwardly, Robby is an Audi RS7 sport sedan, bright red and tarted up with black racing stripes and a giant logo. On the inside, however, it contains some of the most sophisticated autonomous-driving equipment-cameras, laser scanners, accelerometers, precision GPS receivers, microprocessors-on the planet.
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