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Mode Components Highway Public roads 46,893 miles of Interstate highway116,573 miles of other National Highway System roads3,869,541 miles of other roads Air Public-use airports 5,233...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 2007 Resident population (thousand) 248,791 301,621 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 changes...
Index: 1990 = 1.0
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Year Carbon monoxide Nitrogen oxides Volatile organic compounds PM-10; PM-2.5 Surfur dioxide Ammonia ...Index: 1990 = 1.0
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Key: R = revised, PM-10 = airborne particulates of less than 10 microns, PM-2.5 = airborne particulates of less than 2.5...
Million metric tons of carbon
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Year RResidential RCommercial RIndustrial RTransportation 1985 246 190 425 384 1986 244 190 412 399 1987 251 197...Excel | CSV | Table Version
Key: R = Revised.
Notes: 2007 data are preliminary. One ton of carbon equals 3.667 tons of carbon dioxide gas. Electric utility emissions are distributed...
Miles per gallon
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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....Excel | CSV | Table Version
Key: R = revised.
Notes: Fuel economy is miles divided by gallons. Whenever there are more than one fuel economy values, dividing the...