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Mode 1990 2000 2006 2007 Total all bridges 572,205 589,674 597,340 599,893 Urban 108,770 133,384 146,041 151,102 Rural 463,435 456,290 451,299 448,791 Structurally deficient...Excel | CSV
Mode Components Highway (2005) Public roads 46,871 miles of Interstate highway 115,502 miles of other National Highway System roads 3,849,259 miles of other roads Air Public-use...Statistics published in this Pocket Guide to Transportation come from many different sources. Some statistics are based on samples and are subject to sampling variability. Statistics may also be subject to omissions and errors in reporting, recording, and processing.
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America's transportation system continues to change along with the population, work force, and economy. The following table puts those changes in perspective:
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Context 1990 2006 Resident population (thousand) 248,791 299,398 Total area...Air carrier—Certificated provider of scheduled and nonscheduled services.
Chained dollars—A method to measure real changes in dollar values between years that uses chain-type indexes, rather than constant dollars. The method first calculates the real...
Index: 1990 = 1.0
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Year Carbon monoxide CO Nitrogen oxide NOx Volatile organic compounds VOC Particle matters Surfur dioxide SO2 Ammonia...Index: 1990 = 1.0
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Key: PM-10 and PM-2.5 = airborne particulates of less than 10 microns or 2.5 microns, respectively.
Notes: Data in...
Million metric tons of carbon
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Year Residential Commercial Industrial Transportation 1985 246 190 425 384 1986 244 190 412 399 1987 251 197 427 411...Excel | CSV | Table Version
Notes: 2006 data are preliminary.
One ton of carbon equals 3.667 tons of carbon dioxide gas. Electric utility emissions are distributed across sectors....
Miles per gallon
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Year Cars Light Truck 1985 27.0 20.6 1986 27.9 21.4 1987 28.1 21.6 1988 28.6 21.2 1989 28.1 20.9...