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Acknowledgments US Department of Transportation - BTS

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Appendix B: GlossaryMOTOR B<strong>US</strong> (Transit): A rubber-tired, self-propelled,manually steered bus with fuel supplyonboard the vehicle. Motor bus types include:intercity, school, and transit.MOTORCYCLE: A two- or three-wheeled motorvehicle designed to transport one or two people,including motor scooters, minibikes, and mopeds.NATIONALS (Air): Air carrier groups withannual operating revenues between $100 millionand $1 billion.NATURAL GAS: A naturally occurring mixture<strong>of</strong> hydrocarbon and nonhydrocarbon gases foundin porous geologic formations beneath the Earth'ssurface, <strong>of</strong>ten in association with petroleum. Theprincipal constituent is methane.NATURAL GAS PLANT LIQUIDS: Liquidsrecovered from natural gas in processing plants orfield facilities, or extracted by fractionators. Theyinclude ethane, propane, normal butane, isobutane,pentanes plus, and other products, such asfinished motor gasoline, finished aviation gasoline,special naphthas, kerosene, and distillate fueloil produced at natural gas processing plants.NEAR MIDAIR COLLISION (Air): An incidentin which the possibility <strong>of</strong> a collision occurred asa result <strong>of</strong> aircraft flying with less than 500 feet <strong>of</strong>separation, or a report received from a pilot orflight crew member stating that a collision hazardexisted between two or more aircraft.NONOCCUPANT (Automobile): Any personwho is not an occupant <strong>of</strong> a motor vehicle intransport (e.g., bystanders, pedestrians, pedalcyclists,or an occupant <strong>of</strong> a parked motor vehicle).NONRESPONSE ERROR: Error that resultsfrom some members <strong>of</strong> the sample or census notproviding information. Nonresponse bias resultsfrom a systematic difference between those whodo and those who do not respond to the measurementinstrument.NONSAMPLING ERROR: All sources <strong>of</strong> bias orinaccuracy in a study other than sampling error.Examples <strong>of</strong> nonsampling errors include processing,recording, or dataentry errors; nonresponseerror; and response error.NONSCHEDULED SERVICE (Air): Revenueflights not operated as regular scheduled service,such as charter flights, and all nonrevenue flightsincident to such flight.NONSELF-PROPELLED VESSEL (Water): A vesselwithout the means for self- propulsion.Includes dry cargo and tanker barges.NONTRAIN INCIDENT: An event that resultsin a reportable casualty, but does not involve themovement <strong>of</strong> ontrack equipment, and does notcause reportable damage above the thresholdestablished for train accidents.NONTRESPASSERS (Rail): A person lawfully onany part <strong>of</strong> railroad property used in railroadoperations, or a person adjacent to railroad premiseswhen injured as the result <strong>of</strong> railroad operations.NONVESSEL-CASUALTY-RELATED DEATH:A death that occurs onboard a commercial vesselbut not as a result <strong>of</strong> a vessel casualty, such as acollision, fire, or explosion.OCCUPANT: Any person in or on a motor vehiclein transport. Includes the driver, passengers,and persons riding on the exterior <strong>of</strong> a motorvehicle (e.g., a skateboard rider holding onto amoving vehicle). Excludes occupants <strong>of</strong> parkedcars unless they are double parked or motionlesson the roadway.OCCUPATIONAL FATALITY: Death resultingfrom a job-related injury.OPERATING EXPENSES (Air): Expensesincurred in the performance <strong>of</strong> air transportation,based on overall operating revenues and expenses.Does not include nonoperating income andexpenses, nonrecurring items, or income taxes.OPERATING EXPENSES (Rail): Expenses <strong>of</strong> furnishingtransportation services, including maintenanceand depreciation <strong>of</strong> the plant used in theservice.OPERATING EXPENSES (Transit): The total <strong>of</strong>all expenses associated with operation <strong>of</strong> an individualmode by a given operator. Includes distributions<strong>of</strong> “joint expenses” to individual modesand excludes “reconciling items,” such as interestexpenses and depreciation. Should not be confusedwith “vehicle operating expenses.”OPERATING EXPENSES (Truck): Includesexpenditures for equipment maintenance, supervision,wages, fuel, equipment rental, terminal operations,insurance, safety, and administrative andgeneral functions.

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