Physically demanding work was defined as work involving repetitive lifting, load-carrying or other significant physical exertion.

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Functionally obsolete is a different story, Stidger said, explaining that bridges carrying this tag also carry major design problems, diminishing their load-carrying capacity.

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In Texas, where Amarillo saw 19 inches of snow Monday, fierce winds whipped snow into whiteout conditions that left truck driver and CNN iReporter Phillip Prince -- carrying a load of frozen pizzas -- stranded on Interstate 40 near Groom for nine hours.

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In the past, Hakuta might find himself carrying a load of stainless-steel pipes from a factory in Tokyo's suburbs to Nagoya, only to return home empty-handed.

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On some routes, like shuttle flights to New York, the airline is carrying one-fifteenth of its usual load.

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Wainwright (5-3) entered the game second in the National League with 58 2-3 innings but felt comfortable carrying that load.

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While it's thick, it's hardly unwieldy, nor is it weighty -- it adds just 3.77 pounds (1.71kg) to your carrying load.

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