well, with the way US cities are built you are basically going to force the poor to spend significant portions of their days on a daily commute... this leaves them less time to spend with their children...
in brazil the poor spend an average of something like a fifth of their time awake commuting. you'd have a similar problem here because of urban sprawl... poor people would be severely limited in their job choice....
basically the ability to build a functioning public transportation system in many US cities is extremely difficult.
i prefer more egalitarian means whereby everyone regardless of income level is forced off the roads sometimes...
in Sao Paulo they don't allow certain licence plate numbers to drive in the center of the city on certain days..... i.e. licences ending in 0 or 1 can't drive on monday, 2 and 3 can't drive on tuesday, etc.... it forces people to learn to carpool..... it's not the best system, but it's the most egalitarian....
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