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U.S. keeps building new highways while letting old ones crumble

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The agency developed computer software more than a decade ago to help states determine which projects would generate the most return on investment by meeting goals such as reducing congestion and improving the mobility of people and goods. But most states don’t use it, and those that do may simply ignore the recommendations.

When the GAO asked state transportation departments in 2010 what factors they considered in their transportation plans, only 11 states said economic analysis was “very important.”

Taylor, the UCLA professor, said transportation decisions had to consider geographic needs as well as economic ones.

“It’s difficult to come up with objective criteria,” he said. “It’s just a very complex terrain.”

Half a century ago, America had a shared vision and policy around the Interstate Highway System, a massive national public-works project that drove economic growth for decades.

“Those days are gone,” said Earl Swift, the author of “The Big Roads,” a history of interstates. “We are a long way away from that unity of purpose we had in 1956.”

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(Chris Adams contributed to this report.)

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