On what date will the US magnetic highway system be completed?

Caryl Rivers weighs in: For Sarah Palin, It's Not So Easy Being Green

Is Palin trying to walk a tightrope between American voters increasingly concerned about the survival of the planet and the extreme Christian right that forms the base of her most enthusiastic support?
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Among the well known leftists worrying about climate change are the U.S. Army, Mobile Oil and the American Trucking Association, notes Amy Zuckerman. She is the executive editor of Footprint, a new global web magazine devoted to the issues of greenhouse gases, transportation and climate change.
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Move out 20 or more years, and U.S. trucks may flow along magnetic highways, barely touching the ground and using only minimal fuel, reports Zuckerman.