| Terms | Definitions |
|---|
| O3 | Ozone ( National Air Quality Data (AIRS) ) |
| OAG | Official Airline Guide ( Aviation Support Tables ) |
| OMC | Office of Motor Carriers ( Federal Motor Carrier Safety Administration Census File ) |
| Objects Not Fixed | Objects that are movable or moving but are not motor vehicles. Includes pedestrians, pedalcyclists, animals, or trains (e.g., spilled cargo in roadway). ( Fatality Analysis Reporting System ) |
| Occupancy | The number of persons, including driver and passenger(s) in a vehicle. NPTS occupancy rates are generally calculated as person miles divided by vehicle miles. ( Nationwide Personal Transportation Survey ) |
| Occupant | Any person who is in or upon a motor vehicle in transport. Includes the driver, passengers, and persons riding on the exterior of a motor vehicle. ( Fatality Analysis Reporting System ) |
| Occupation | A set of activities or tasks that employees are paid to perform. Employees that perform essentially the same tasks are in the same occupation, whether or not they are in the same industry. Some occupations are concentrated in a few particular industries, other occupations are found in the majority of industries. ( Occupational Employment and Wage Estimates ) |
| Occupational Class | Occupational categories such as executive, manegerial, administrative, sales, production, and farming. ( Census Transportation Planning Package ) |
| Occupational Division | Ten groups of related industries as defined within the Standard Industrial Classification system. The divisions include broad categories such as services, retail trade, farming, and construction. BLS replaced the SIC system with the Standard Occupational Classification system in 1999. ( Occupational Employment and Wage Estimates ) |
| Occupational Major Group | The groups of industries defined by 2- and 3-digit SIC levels. BLS replaced the SIC system with the Standard Occupational Classification system in 1999. ( Occupational Employment and Wage Estimates ) |
| Octane Rating | A measure of a gasoline's resistance to ignite spontaneously under compression. Heptane and octane, two hydrocarbons, have a very low and high resistance to ignite, respectively. Gasolines are rated from 0 (resistance equal to heptane) to 100 (resistance equal to octane). ( U.S. Retail Gasoline Prices ) |
| Offshore | That geographic area that lies seaward of the coastline. In general, the coastline is the line of ordinary low water along with that portion of the coast that is in direct contact with the open sea or the line marking the seaward limit of inland water. ( Pipeline Safety Statistics ) |
| Open-Cut | Rail transit way below surface in an excavated cut that has not had a covering constructed over it. Transition segments to open cut or subway-tunnel/tube segments are included. ( National Transit Database ) |
| Operating Carrier | An air carrier engaged directly in the operation of aircraft in passenger air transportation. ( Airline Origin and Destination Survey (DB1B) ) |
| Operating Expenditure | Expenses from wages and salaries, operating supplies, insurance expenses, and other miscellaneous expenses. ( Motor Carrier Financial & Operating Information ) |
| Operating Expenses | Expenses incurred in the performance of air transportation, based on overall operating revenues and overall operating expenses. Does not include nonoperating income and expenses, nonrecurring items, or income tax. ( Air Carrier Financial Reports (Form 41 Financial Data) ) |
| Operating Labor | The employees engaged in the operation of the transit system categorized by their functions described in the Uniform System of Accounts (USOA). ( National Transit Database ) |
| Operating Region | One of six regions used to describe the region where an air carrier operates: International (Atlantic, Pacific, and Latin America), System (all regions covered by an air carrier), Domestic (U.S.), Atlantic, Pacific, Latin America. For those carriers with international flights, the operating region is determined by where its flights leave and enter the U.S. (i.e. across the Atlantic, Pacific or Gulf/Mexico) ( Aviation Support Tables ) |
| Operating Revenue | Revenue from the transportation of property or passengers by motor carrier. ( Motor Carrier Financial & Operating Information ) |
| Operating Revenues | Revenues from the performance of air transportation and related incidental services. Includes (1) transport revenue from the carriage of all classes of traffic in scheduled and nonscheduled services, and (2) nontransport revenues consisting of Federal subsidy (where applicable) and revenues for services related to air transportation. ( Air Carrier Financial Reports (Form 41 Financial Data) ) |
| Origin | Starting point of a trip. ( Nationwide Personal Transportation Survey ) |
| Origin State FIPS | The FIPS code for the origin state. (see FIPS) ( Air Carrier Statistics ) |
| Other And Unknown Modes | Shipments for which modes were not reported, or were reported by the respondent as Other or Unknown. ( Commodity Flow Survey ) |
| Other Freeways and Expressways | All urban principal arterial with limited control of access not on the Interstate system. ( Fatality Analysis Reporting System ) |
| Other General Cargo Vessel | A vessel designed to accommodate cargo. Excludes bulk carriers, containerships, passenger vessels, ro-ros, and tankers. ( Foreign Traffic Vessel Entrances and Clearances ) |
| Other Modes | Airplane: Includes commercial airplanes and smaller planes that are available for use by the general public in exchange for a fare. Private planes and helicopters are included under other. Taxi: The use of a taxicab by a driver for hire or by a passenger for fare. Also includes airport limousines. Does not include rental cars if they are privately operated and not picking up passengers in return for fare. Bicycles: Includes bicycles of all speeds and sizes that do not have a motor. The U.S. national passenger railroad service providing intercity train service. Walk: Includes jogging, walking, etc., provided the origin and destination are not the same. School bus: Includes county school buses, private school buses, and buses chartered from private companies for the express purposes of carrying students to or from school and/or school-related activities. MOPED (Motorized Bicycle) : Includes motorized bicycles equipped with a small engine, typically 2 horsepower or less. Also includes minibikes such as dirt bikes and trail bikes. Note that a motorized bicycle may or may not be licensed for highway use. Other. Includes any types of transportation not listed above. ( Nationwide Personal Transportation Survey ) |
| Other Multiple Modes | Shipments using any other mode combinations not specifically listed in the Commodity Flow Survey tables. ( Commodity Flow Survey ) |
| Other Principal Arterials | Major streets or highways, many with multi-lane or freeway design, serving high-volume traffic corridor movements that connect major generators of travel. ( Fatality Analysis Reporting System ) |
| Other Transport-Related Revenue | Revenues from services such as in-flight sales, rentals and sales or services, supplies and parts. ( Air Carrier Financial Reports (Form 41 Financial Data) ) |
| Other Vehicle | Consists of the following types of vehicles: 1. Large limousine (more than four side doors or stretched chassis) 2. Three-wheel automobile or automobile derivative 3. Van-based motorhome 4. Light-truck-based motorhome (chassis mounted) 5. Large-truck-based motorhome 6. ATV (all terrain vehicle, including dune/swamp buggy) and ATC (all terrain cycle) 7. Snowmobile 8. Farm equipment other than trucks 9. Construction equipment other than trucks (includes graders) 10. Other type vehicle (includes go-cart, fork lift, city streetsweeper). ( Fatality Analysis Reporting System ) |
| Oxygenated Gasoline | Finished motor gasoline formulated with additional oxygen. Oxygenated fuels may reduce the amount of unburned hydrocarbons and carbon monoxide in exhaust. ( U.S. Retail Gasoline Prices ) |
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