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> Having an extra driver per car costs 1 person per person.

If the car has some sort of payload (like a Semi or UPS truck), then this makes total sense. If the human is the payload, then there is no benefit at all. (Well, other than being able to multi-task -- but if you're working from your car, why not just work from home and skip the commute?)

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You can multi-task in areas other than work. You could be reading a book, playing a musical instrument, making phone calls, or even enjoying some recreational refreshments that impair your ability to operate a motor vehicle.

Much like taking public transportation to work, it turns commute time into time that can be spent doing something other than paying attention to the commute.

Recreational refreshment? Another technology revolution that will be driven by the fact, that sex sells?

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