Are Driverless Cars Better for Cities or Suburbs?

Here are two competing theories of how the coming transportation revolution could impact American life.

One possibility is that easy mobility—driverless cars, on-demand deliveries, and the like—will dull the pains of suburban life. The long commute, the wasted driving time, the difficulty of running out for a carton of milk—the inconvenience and expense of the subdivision will be melted away by hot new technology. Milk by drone, what a concept!

Another is that easy mobility produces greater advantages in the city.