'Smart Roads' or 'Smart Transportation' refers to an integrated system of roads, sensors and autos. Two particular areas of benefit would be much better traffic flow through congested areas and the ability to take over long distance driving tasks. Most of these (now not so) futuristic imaginings picture cars being designed to link together so that those with similar destinations can share the propulsion load and reduce wind drag.
I too like long rides on trains. Commuter trains can suck but on longer trips you can meet and get to know some interesting people.
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