More than 18,000 of the busiest bridges in metro areas in the country are rated as "structurally deficient," according to a study by Transportation for America. Most bridges were designed to last 50 years, and about one third of them have reached or surpassed that age, said Andrew Herrmann, president-elect of the American Society of Civil Engineers. Sen. Frank Lautenberg, D-N.J., said, "Those in Washington who are undercutting transportation projects must stop, and work together to invest in infrastructure that will create jobs, make our communities safer and improve the economy for all."

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