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Acknowledgments US Department of Transportation - BTS

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Appendix B: GlossarySUBCOMPACT CAR: As designated by the automobileindustry, a car with a wheelbase between95 and 99 inches.SUPPLEMENTAL AIR CARRIER: An air carrierauthorized to perform passenger and cargo charterservices.TANKER: An oceangoing ship designed to haulliquid bulk cargo in world trade.TON-MILE (Truck): The movement <strong>of</strong> 1 ton <strong>of</strong>cargo the distance <strong>of</strong> 1 mile. Ton-miles are calculatedby multiplying the weight in tons <strong>of</strong> eachshipment transported by the miles hauled.TON-MILE (Water): The movement <strong>of</strong> 1 ton <strong>of</strong>cargo the distance <strong>of</strong> 1 statute mile. Domestic tonmilesare calculated by multiplying tons moved bythe number <strong>of</strong> statute miles moved on the water(e.g., 50 short tons moving 200 miles on a waterwaywould yield 10,000 ton-miles for that waterway).Ton-miles are not computed for ports. Forcoastwise traffic, the shortest route that safe navigationpermits between the port <strong>of</strong> origin and destinationis used to calculate ton-miles.TRAFFICWAY (Highway): Any right-<strong>of</strong>-wayopen to the public as a matter <strong>of</strong> right or customfor moving persons or property from one place toanother, including the entire width between propertylines or other boundaries.TRAIN LINE MILEAGE: The aggregate length <strong>of</strong>all line-haul railroads. It does not include themileage <strong>of</strong> yard tracks or sidings, nor does itreflect the fact that a mile <strong>of</strong> railroad may includetwo or more parallel tracks. Jointly-used track iscounted only once.TRAIN-MILE: A train-mile is the movement <strong>of</strong> atrain, which can consist <strong>of</strong> many cars, the distance<strong>of</strong> 1 mile. A train-mile differs from a vehicle-mile,which is the movement <strong>of</strong> one car (vehicle) thedistance <strong>of</strong> 1 mile. A 10-car (vehicle) train traveling1 mile is measured as 1 train-mile and 10 vehicle-miles.Caution should be used whencomparing train-miles to vehicle-miles.TRANSIT VEHICLE: Includes light, heavy, andcommuter rail; motor bus; trolley bus; van pools;automated guideway; and demand-responsivevehicles.TRANSSHIPMENTS: Shipments that enter orexit the United States by way <strong>of</strong> a U.S. Customsport on the northern or southern border, butwhose origin or destination was a country otherthan Canada or Mexico.TRAVEL PARTY (American Travel Survey):Household and nonhousehold members travelingtogether on a trip.TRESPASSER (Rail): Any person whose presenceon railroad property used in railroad operations isprohibited, forbidden, or unlawful.TRIP (American Travel Survey): Roundtrip travelto a destination at least 100 miles from home. Thefollowing types <strong>of</strong> trips are excluded: 1) travel aspart <strong>of</strong> an operating crew on a train, airplane,truck, bus, or ship; 2) regular commuting to workor school; 3) one-way trips to move to a new destination;and 4) trips by members <strong>of</strong> the ArmedForces while on active duty.TROLLEY B<strong>US</strong>: Rubber-tired electric transitvehicle, manually steered and propelled by amotor drawing current, normally through overheadwires, from a central power source.TR<strong>US</strong>T FUNDS: Accounts that are specificallydesignated by law to carry out specific purposesand programs. Trust Funds are usually financedwith earmarked tax collections.TUG BOAT: A powered vessel designed for thetowing or pushing <strong>of</strong> ships, dumb barges, pushedtowedbarges, and rafts, but not for the carriage<strong>of</strong> goods.U.S. FLAG CARRIER OR AMERICAN FLAGCARRIER (Air): One <strong>of</strong> a class <strong>of</strong> air carriersholding a Certificate <strong>of</strong> Public Convenience andNecessity issued by the U.S. <strong>Department</strong> <strong>of</strong> <strong>Transportation</strong>and approved by the President, authorizingscheduled operations over specified routesbetween the United States (and/or its territories)and one or more foreign countries.UNLEADED GASOLINE: See Gasoline.UNLINKED PASSENGER TRIPS (Transit): Thenumber <strong>of</strong> passengers who board public transportationvehicles. A passenger is counted each timehe/she boards a vehicle even if on the same journeyfrom origin to destination.URBAN HIGHWAY: Any road or street withinthe boundaries <strong>of</strong> an urban area. An urban area isan area including and adjacent to a municipalityor urban place with a population <strong>of</strong> 5,000 or

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