| Terms | Definitions |
|---|
| ROW | Right of Way ( National Transit Database ) |
| RVR | Runway Visual Range. The range over which the pilot of an aircraft on the centerline of a runway can see the runway surface markings or the lights delineating the runway or identifying its centerline. ( Aviation Accidents Database and Synopses ) |
| RVV | Runway Visibility Value. The visibility determined for a particular runway by a transmissometer. A meter provides a continuous indication of the visibility (reported in miles or fractions of miles) for the runway. ( Aviation Accidents Database and Synopses ) |
| Race | The race with which the respondent and other household members most closely identify. Choices include: White, Black, American Indian, Eskimo, Or Aleut, Asian Or Pacific Islander, and Other Race. ( American Travel Survey ) |
| Rail/Grade Crossing | A location where one or more railroad tracks cross a public highway, road, or street or a private roadway, and includes sidewalks and pathways at or associated with the crossing. ( Trucks Involved Fatal Accidents ) |
| A location where one or more railroad tracks cross a public highway, road, or street or a private roadway. Includes sidewalks and pathways at or associated with the crossing. ( Fatality Analysis Reporting System ) |
| Railroad | Includes common carriers (for-hire carriers that hold themselves out to serve the general public at reasonable rates and without discrimination) and private railroads (carriers not open to the public at large). ( Commodity Flow Survey ) |
| Railroad Carfloat | A barge equipped with railroad tracks used to move rail cars across water. Typically, the carfloat is towed by a tugboat. ( National Ferry Database ) |
| Railroad Retirement | The Federal railroad retirement system. ( National Transit Database ) |
| Railroad Type | Railroads are catergorized by size. Class I railroads are those with an annual operating revenue of $250 million or more after applying the railroad revenue deflator formula, which is based on the Railroad Freight Price Index developed by the U.S. Department of Labor, Bureau of Labor Statistics. Class II railroads have annual revenues between $40 million and the revenue minimum for Class I railroads, and at least 350 track miles. Class III railroads have less than 350 track miles and less than $40 million in annual revenues. ( Railroad Accident/Incident Reporting System ) |
| Ramp To Ramp Time/Hours | The time computed from the moment an aircraft first moves under its own power for purposes of flight, until it comes to rest at the next point of landing. ( Air Carrier Statistics ) |
| Real Dollars | The value of goods or services measured in constant dollars. Constant dollars are current dollars that have been adjusted for inflation in terms of a base period. ( Gross State Product ) |
| Rear-end Collision | A collision in which one vehicle collides with the rear of another vehicle. ( Fatality Analysis Reporting System ) |
| Reconciling Items | Any items where accounting practices vary for handling these expenses as a result of local ordinances and conditions. Reconciling items include depreciation and amortization, interest payments, leases and rentals. They are called reconciling items because they are needed to provide an overall total that is consistent with local published reports. ( National Transit Database ) |
| Recreational Boat | Any vessel manufactured or used primarily for noncommercial use; leased, rented or chartered to another for the latter's noncommercial use ( Recreational Boating Accident Reporting Database ) |
| Reformulated Gasoline | Finished motor gasoline formulated for use in motor vehicles, the composition and properties of which meet the requirements of the reformulated gasoline regulations promulgated by the U.S. Environmental Protection Agency. This category includes oxygenated fuels program reformulated gasoline. ( U.S. Retail Gasoline Prices ) |
| Regular | Gasoline having an antiknock index, i.e., octane rating, greater than or equal to 85 and less than 88. Note: Octane requirements may vary by altitude. ( U.S. Retail Gasoline Prices ) |
| Reportable Damage | Reportable damage includes labor costs and all other costs to repair or replace in kind damaged on-track equipment, signals, track, track structures, or roadbed. Reportable damage does not include the cost of clearing a wreck; however, additional damage to the above listed items caused while clearing the wreck is to be included in your damage estimate. ( Railroad Accident/Incident Reporting System ) |
| Reporting Carrier | The carrier that submitted data to the Office of Airline Information for a given passenger segment. ( Airline Origin and Destination Survey (DB1B) ) |
| Reporting Threshold | The amount of total reportable damage resulting from a train accident which, if exceeded, requires the preparation and forwarding of an FRA accident/incident form by the railroads involved. For accidents occurring in calendar years 1991-1996, the reporting threshold was $6,300. For accidents occurring in calendar year 1997, the reporting threshold was $6,300. For accidents occurring in calendar years 1998-2001, the reporting threshold was $6,500. For accidents occuring in calendar years 2002-2003, the reporting threshold is $6,700. ( Railroad Accident/Incident Reporting System ) |
| Respondent | The person who reported the information about the trip. Survey procedures specified that persons 15 years old or older be interviewed personally about any trips they took during the reference period. Household trips taken by more than one household member were reported by the first member interviewed who went on the trip. Trips taken by household members under 15 years of age were reported by a knowledgeable adult household member. Procedures were established to ensure that a household trip taken by more than one household member was reported only once with an indication of each of the household members on the trip. ( American Travel Survey ) |
| Responsible Party | The vessel or other party whose actions resulted in a marine violation case. Also, the vessel or party that is not in compliance with USCG safety and environmental regulations. ( Marine Casualty and Pollution Database ) |
| Restraint System | Manually operated restraint systems include shoulder belts, lap belts, lap and shoulder belt combinations, or child safety seats. Automatic restraint systems include passive belts and air bag systems. ( Fatality Analysis Reporting System, General Estimates System (NASS/GES), Trucks Involved Fatal Accidents ) |
| Restraint Use | The occupant's use of available vehicle restraints including lap belt, shoulder belt, or automatic belt. ( Fatality Analysis Reporting System ) |
| Revenue | Pertaining to activities for which remuneration is received by the carrier. ( Air Carrier Statistics, Small Air Carrier Statistics, Air Carrier Summary Data ) |
| Revenue Passenger Mile | One revenue passenger transported one mile in revenue service. Revenue passenger miles are computed by summation of the products of the revenue aircraft miles on each interairport segment multiplied by the number of revenue passengers carried on that segment. ( Small Air Carrier Statistics ) |
| Revenue Ton Mile | One revenue ton (2,000 pounds) transported one statute mile. ( Small Air Carrier Statistics ) |
| River Mile | Designated mileage from the mouth of the river used for identifying locations along the riverbanks. An exception is the Ohio River, on which mileage commences from the head of the river in lieu of the mouth. ( Marine Casualty and Pollution Database ) |
| River stage | The height of the water at a certain location on a given day. ( Marine Casualty and Pollution Database ) |
| Ro-Ro | See Roll-On/Roll-Off Vessel. ( Foreign Traffic Vessel Entrances and Clearances, National Ferry Database ) |
| RoRo | Roll On / Roll Off ( National Ferry Database ) |
| Roadway | That part of a trafficway designed, improved, and ordinarily used for motor vehicle travel. ( Fatality Analysis Reporting System ) |
| Roadway Function Class | The classification describing the character of service the street or highway is intended to provide. ( Fatality Analysis Reporting System, Trucks Involved Fatal Accidents ) |
| Roadway Profile | Refers to the type of inclination of a segment of the roadway (e.g., level, grade, hilltop). ( Trucks Involved Fatal Accidents ) |
| Roadway Surface Condition | Describes the condition of the roadway at the time of the incident (e.g., dry, wet, icy). ( Trucks Involved Fatal Accidents ) |
| Roadway Surface Type | Describes the predominant material used to construct the roadway surface (e.g. concrete, blacktop, dirt). ( Trucks Involved Fatal Accidents ) |
| Roll-On Roll-Off | A method of ocean cargo service using a vessel with ramps which allows wheeled vehicles to be loaded and discharged without cranes. ( National Ferry Database ) |
| Roll-On/Roll-Off Vessel | A vessel with ramps which allows wheeled vehicles to be loaded and discharged without cranes. ( Foreign Traffic Vessel Entrances and Clearances, National Ferry Database ) |
| Rolling Stock | The vehicles used in a transit system, including buses and rail cars. ( National Transit Database ) |
| Rollover | Rollover is defined as any vehicle rotation of 90 degrees or more about any true longitudinal or lateral axis. ( Fatality Analysis Reporting System, Trucks Involved Fatal Accidents ) |
| Rollover is defined as any vehicle rotation of 90 degrees or more about any true longitudinal or lateral axis. Includes rollovers occurring as a first harmful event or subsequent event. ( Fatality Analysis Reporting System, General Estimates System (NASS/GES) ) |
| Round Trip Distance | Estimated transportation network miles traveled from the residence of the household at the time of the trip to the destination and back. Miles are calculated separately from origin to destination and destination to origin and added together to allow for differences in routes traveled each way. ( American Travel Survey ) |
| Rural | Includes all areas of a state outside of the Federal Highway Administration (FHWA) approved adjusted census boundaries of small urban and urbanized areas. ( Vehicle Miles Traveled, Highway Perfomance Monitoring System ) |
| Rural Major Collectors | Those public roads that are functionally classified as a part of the major collector subclassification of the rural collector system as described in volume 20, appendix 12, Highway Planning Program Manual. ( Vehicle Miles Traveled ) |
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