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Acknowledgments US Department of Transportation - BTS

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Appendix B: GlossaryBLOOD ALCOHOL CONCENTRATION(Highway): A measurement <strong>of</strong> the percentage <strong>of</strong>alcohol in the blood by grams per deciliter.BRITISH THERMAL UNIT: The quantity <strong>of</strong>heat needed to raise the temperature <strong>of</strong> 1 pound<strong>of</strong> water by 1 °F at or near 39.2 °F.BULK CARRIER (Water): A ship with specializedholds for carrying dry or liquid commodities, suchas oil, grain, ore, and coal, in unpackaged bulkform. Bulk carriers may be designed to carry asingle bulk product (crude oil tanker), or accommodateseveral bulk product types (ore/bulk/oilcarrier) on the same voyage or on a subsequentvoyage after holds are cleaned.B<strong>US</strong>: Large motor vehicle used to carry more than10 passengers, includes school buses, intercitybuses, and transit buses.B<strong>US</strong>INESS TRIP (American Travel Survey): Atrip taken for business or business combined withpleasure, or for attending a convention, conference,or seminar.CAFE STANDARDS: See Corporate Average FuelEconomy Standards.CAR-MILE (Rail): The movement <strong>of</strong> a railroadcar a distance <strong>of</strong> 1 mile. An empty or loaded carmilerefers to a mile run by a freight car with orwithout a load. In the case <strong>of</strong> intermodal movements,the designation <strong>of</strong> empty or loaded refersto whether the trailers/containers are moved withor without a waybill.CERTIFICATE OF PUBLIC CONVENIENCEAND NECESSITY (Air Carrier): A certificateissued by the <strong>Department</strong> <strong>of</strong> <strong>Transportation</strong> to anair carrier under Section 401 <strong>of</strong> the Federal AviationAct authorizing the carrier to engage in airtransportation.CERTIFICATED AIR CARRIER: An air carrierholding a Certificate <strong>of</strong> Public Convenience andNecessity issued by the U.S. <strong>Department</strong> <strong>of</strong> <strong>Transportation</strong>(DOT) to conduct scheduled servicesinterstate. These carriers may also conduct nonscheduledor charter operations. Certificated aircarriers operate large aircraft (30 seats or more ora maximum load <strong>of</strong> 7,500 pounds or more) inaccordance with FAR Part 121. See also LargeCertificated Air Carrier.CERTIFICATED AIRPORTS: Airports that serviceair carrier operations with aircraft seatingmore than 30 passengers.CHAINED DOLLARS: A measure used toexpress real prices, defined as prices that areadjusted to remove the effect <strong>of</strong> changes in thepurchasing power <strong>of</strong> the dollar. Real prices usuallyreflect buying power relative to a referenceyear. The “chained-dollar” measure is based onthe average weights <strong>of</strong> goods and services in successivepairs <strong>of</strong> years. It is “chained” because thesecond year in each pair, with its weights,becomes the first year <strong>of</strong> the next pair. Prior to1996, real prices were expressed in constant dollars,a weighted measure <strong>of</strong> goods and services ina single year. See also Constant Dollars and CurrentDollars.CLASS I RAILROAD: A carrier that has anannual operating revenue <strong>of</strong> $250 million or moreafter applying the railroad revenue deflator formula,which is based on the Railroad Freight PriceIndex developed by the U.S. <strong>Department</strong> <strong>of</strong> Labor,Bureau <strong>of</strong> Labor Statistics. The formula is the currentyear's revenues x 1991 average index/currentyear's average index.COASTWISE TRAFFIC (Water): Domestic trafficreceiving a carriage over the ocean, or the Gulf <strong>of</strong>Mexico (e.g., between New Orleans and Baltimore,New York and Puerto Rico, San Franciscoand Hawaii, Alaska and Hawaii). Traffic betweenGreat Lakes ports and seacoast ports, when havinga carriage over the ocean, is also consideredcoastwise.COEFFICIENT OF VARIATION: Ratio <strong>of</strong> thesampling error (or standard error) <strong>of</strong> a statistic tothe value <strong>of</strong> that statistic. Also referred to as relativestandard error.COLLECTOR (Highway): In rural areas, routesthat serve intracounty rather than statewidetravel. In urban areas, streets that provide directaccess to neighborhoods and arterials.COLLISION WITH OBJECT (Transit): An incidentin which a transit vehicle strikes an obstacleother than a vehicle or person (e.g., building, utilitypole). Reports are made if the accident resultsin a death, injury, or property damage over$1,000.COLLISION WITH PEOPLE (Transit): An incidentin which a transit vehicle strikes a person.Excludes suicides and suicide attempts. Reportsare made if the incident results in death, injury, orproperty damage over $1,000.

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