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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...
Transit authorities reporting to the Federal Transit Administration (FTA) provide the number of passengers who board public transportation vehicles rather than the number of passengers they serve. Passenger boardings...
Highway-related capital stock (highway infrastructure, consumer motor vehicles, and trucking and warehousing) represented the majority of the nation’s transportation capital stock, $2,166 billion in 2000 (in 1996 chained dollars1). Highway infrastructure...
The volume of freight carried by railroads increased 26 percent (in tons) and 30 percent (by carload) on railcars between 1991 and 2001 (figure 22). However, on average, the weight of each railcar remained fairly constant. The average weight of a loaded railcar ranged from 63...