Road construction signs are seen Monday, April 30, 2012 in Springfield, Ill. Much of America’s infrastructure, including its interstate highway system, is more than half a century old and in need of serious work to keep pace with a rising population. Highway, rail and airport bottlenecks slow the movement of goods and commuters, costing billions in wasted time and fuel and even measurably slowing the economy. (AP Photo/Seth Perlman)

Associated Press
Road construction signs are seen Monday, April 30, 2012 in Springfield, Ill. Much of America’s infrastructure, including its interstate highway system, is more than half a century old and in need of serious work to keep pace with a rising population. Highway, rail and airport bottlenecks slow the movement of goods and commuters, costing billions in wasted time and fuel and even measurably slowing the economy. (AP Photo/Seth Perlman)
Road construction signs are seen Monday, April 30, 2012 in Springfield, Ill. Much of America’s infrastructure, including its interstate highway system, is more than half a century old and in need of serious work to keep pace with a rising population. Highway, rail and airport bottlenecks slow the movement of goods and commuters, costing billions in wasted time and fuel and even measurably slowing the economy. (AP Photo/Seth Perlman)
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