The promise of self-driving cars is to take our vehicle fleets from 5% utilization to near-100% utilization, reducing congestion, parking problems, emissions and road accidents. But what if the cheapest way to "park" your autonomous vehicle is to have it endlessly circle the block while you're at work? What do we do about the lost jobs of bus-, truck- and cab-drivers? How will we pay for roads if gas-tax revenues plummet thanks to all-electric fleets? Read the rest