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Here’s an estimate, from Driverless Cars: Optional by 2024, Mandatory by 2044

“When we modeled that for Ann Arbor, Mich., we found we’d need only 15 percent of the cars now owned there,” for a per-mile cost savings of 75 percent, says Larry Burns, director of the Program on Sustainable Mobility at the Earth Institute of Columbia University, in New York City. Burns is no ivory-tower academic: In his previous job he headed up research and development for General Motors. …

Robocars would be shared, and that would make them both convenient and cheap to use. Vehicles would be fewer in number but far more heavily used, picking up new passengers near where they left the last ones off. Such vehicle-sharing schemes are spreading, even though today’s dumb vehicles tend not to be there for you when you need them. One reason is that they accumulate at popular destinations. It’d be different for a car that could come when you called and leave when you were done with it. …

Professional drivers. Say good-bye to all of them—5 million people in the United States alone. In a world of autonomous cargo carriage, machines could hitch trucks to standardized containers of stuff.  … “Could we enter into a world where things are brought to us in a Segway-size pod?” wonders Burns of Columbia. “And if so, what does that do to retail big-box stores?