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KEY: apt. = apartment; condo = condominium.
SOURCE: U.S. Department of Transportation, Bureau of Transportation Statistics...
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NOTES: Air includes commercial and general aviation. Waterborne includes commercial and recreational vessels. Commercial aviation data...
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NOTE: Support includes offshore support and crewboats. Liquid barge includes tank barges.
SOURCE: U.S. Department of...
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NOTES: Percentages may not add to 100 due to rounding.
Loadings are based on equivalent single-axle loads (ESALs), a...
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SOURCES: Passenger-miles, ton-miles, and energy use (unless otherwise noted)—U.S. Department of Transportation, Bureau of...
Work zones on freeways cause an estimated 24 percent of the nonrecurring delays on freeways and principal arterials [1]. According to the Federal Highway Administration, the purpose of maintenance—which includes restoration, resurfacing, minor widening,...
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1 Teragrams of CO2 equivalent—1 TgCO2 Eq = 1 million metric ton of carbon equivalent x (44/12). A teragram = 1 trillion grams....
Excluding gas pipelines, all modes of freight transportation, combined, generated nearly 4 trillion domestic ton-miles in 2000, 20 percent more than in 1990. This represents an average growth rate of almost 2 percent per year during the decade [1].
Domestic...
There were an estimated 3.6 million highway-related injuries in the United States in 2001, according to data reported to the U.S. Consumer Product Safety Commission (CPSC)1 (see box) [1]. An estimated 3.3 million of these injuries involved motor vehicle...
National data on air emissions are estimated by the U.S. Environmental Protection Agency (EPA). EPA’s National Emissions Inventory (NEI) is updated annually and covers mobile, stationary, and area sources of pollution regulated under...