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I imagine us living in hybrid-arcologies... high-rise but low-energy-use residential complexes set within farmlands sufficient to feed each arcology. We'll still maintain some roads, but most travel will be delivery trucks and the occassional long-distance traveller. A lot of commercial transactions already take place online. Even more of it should, to eliminate unnecessary travel.
That would leave long stretches of empty road used merely for recreation and access to recreation sites. Instead of sharing it with harried drivers doing a fifty mile commute to work, you'd share it with other people out for a leisurely drive in the countryside, in their ultra-lightweight electric/human/ethanol/biodiesel-powered buggies.
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