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Highway travel times increased between 1990 and 2000 in 70 of the 75 urban areas studied by the Texas Transportation Institute. The average Travel Time Index (TTI) for these areas in 2000 was 1.39, an increase from 1.31 in 1990 [2]. This means that in 2000, it took...
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NOTE: Locomotive data are for Class I railroads only. Freight car data cover Class I railroads, other railroads, and private car owners.
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NOTES: 1999 is the most recent year for which these data are available by country. For these...
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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...
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NOTE: The Travel Time Index is the ratio of peak period travel time to free-flow travel time. It expresses the...
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NOTES: Total transportation-related final demand is the sum of all consumer, private business, and government purchases of...
Transportation-related sources typically account for most oil reported to be spilled into U.S. waters reported each year.1 For instance, transportation’s share of the total volume of oil spilled between 1991 and 2000 varied from a high of 97 percent in 1996...
The U.S. Coast Guard (USCG) summarizes reported oil spill data in its Pollution Incidents In and Around U.S. Waters, A Spill Release Compendium: 1969–2000. USCG aggregates the source data into five categories: marine vessels...
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KEY: Functionally obsolete refers to bridges that do not have the lane widths, shoulder widths, or vertical clearances adequate to serve traffic demand, or the...
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KEY: Functionally obsolete refers to bridges that do not have the lane widths, shoulder widths, or vertical clearances adequate to serve traffic demand, or the...