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The growth of e-commerce is putting enormous new demands on U.S. highways, airports and other infrastructure, which must be modernized with sustainable funding, FedEx Corp. Chairman and CEO Frederick Smith said.

The Brent Spence Bridge between Ohio and Kentucky carries twice as much traffic as it was built to handle — it’s 54 years old and functionally obsolete.

With President Trump promising to rebuild crumbling U.S. highways, bridges and buildings, states have begun submitting lists of priority projects in need of funding.

Falling fuel prices, crumbling roads and bridges and a gridlocked Congress have U.S. states, even those run by Republicans, debating higher taxes.