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Mode 1990 2000 2007 2008 Total all bridges 572,205 589,674 599,766 601,396 Urban 108,770 133,384 151,171 153,407 Rural 463,435 456,290 448,595 447,989 Structurally deficient...Excel | CSV
Mode Components Highway (2007) Public roads 46,934 miles of Interstate highway 116,813 miles of other National Highway System roads 3,884,777 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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Americas 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 2008 Resident population (thousand) 248,791 304,060...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 changes between...
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Index: 1990 = 1.0
Year Carbon monoxide Nitrogen oxide Volatile organic compounds PM-10; PM-2.5 Surfur dioxide Ammonia 1990 1.00 1.00 1.00 1.00 1.00 1....Excel | CSV | Table Version
Index: 1990 = 1.0
Key: R = revised, PM-10 = airborne particulates of less than 10 microns, PM-2.5 = airborne particulates of less than 2.5 microns, U...
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Million metric tons of carbon
Year RResidential RCommercial RIndustrial RTransportation 1985 246 190 425 384 1986 244 190 412 399 1987 251 197 423 411...Excel | CSV | Table Version
Key: R = Revised.
Notes: 2008 data are preliminary. One ton of carbon equals 3.667 tons of carbon dioxide gas. Electric utility emissions are distributed...
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Miles per gallon
Year RCars RLight Trucks 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...