Now many cities are converting some or all of their one-way streets back to two way flow. The intent is to help revitalize urban business districts. However, there is controversy about this move, because the slowing traffic flow, and increased stop and go may increase fuel consumption and pollution. This may indeed be a near term consequence of the change. However, looking longer term there may actually be a benefit to the degraded traffic flow. If the two way streets actually help urban areas to recover economically, more people may move back into city centers rather than living in outlying suburban areas. If this happened than many of those people may end up walking or using mass transit like they do in cities like New York or Chicago rather than driving everywhere. This could conceivably help to improve the environment. Unfortunately, it's not very clear cut as to which way is the most beneficial. Only time will tell.
[Source: USA Today via Hugg.com]