With these autonomous cars, who needs you to drive?

Since 1978, when microprocessors were first installed in the trip odometer of a Cadillac Seville, the number of chips in the average automobile has grown such that cars now contain anywhere from 50 to 200 processors and a mile of wiring. The increasing prevalence of hybrid and electric cars is accelerating that trend; the plug-in electric Chevrolet Volt, for example, requires 10 million lines of code, 2 million more than it takes to run a Boeing 787. So carmakers are coming to Silicon Valley, where code is king.