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Planning Glossary

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Keyword Definition
Rural Highway Any highway, road, or street that is not an urban highway.
Reformulated Gasoline 1) Gasoline whose composition has been changed to meet performance specifications regarding ozone-forming tendencies and release of toxic substances into the air from both evaporation and tailpipe emissions. Reformulated gasoline includes oxygenates and, compared with gasoline sold in 1990, has a lower content of olefins, aromatics, volatile components, and heavy hydrocarbons. 2) Gasoline specifically developed to reduce undesirable combustion products.
Regionally Significant Project A project that is on a facility which serves regional transportation needs.
Rail A rolled steel shape laid in two parallel lines to form a track for carrying vehicles with flanged steel wheels. (TRB1)
Restricted Area Airspace designated under Federal Aviation Regulations (FAR), Part 73, within which the flight of aircraft, while not wholly prohibited, is subject to restriction. Most restricted areas are designated joint use and Intermediate Fix/Visual Flight Rules IF/VFR operations in the area may be authorized by the controlling Air Traffic Control (ATC) facility when it is not being utilized by the using agency. Restricted areas are depicted on en route charts. Where joint use is authorized, the name of the ATC controlling facility is also shown. (FAA8)
Relative Need Formula An allocation formula used by BIADOT to distribute construction funds to the 12 BIA area offices.
Road An open way for the passage of vehicles, persons, or animals on land. (DOI4)
Regional Planning Organization (RPO) An organization that performs planning for multi-jurisdictional areas. MPOs, regional councils, economic development associations, rural transportation associations are examples of RPOs.
Research Investigation or experimentation aimed at the discovery of new theories or laws and the discovery and interpretation of facts or revision of accepted theories or laws in the light of new facts. (49CFR171)
Revenue Passenger-Mile One revenue passenger transported one mile.
Revenue Ton-Mile One short ton of freight transported one mile.
Revenue Vehicle-Miles (Transit) One vehicle (bus, trolley bus, or streetcar) traveling one mile, while revenue passengers are on board, generates one revenue vehicle-mile. Revenue vehicle-miles reported represent the total mileage traveled by vehicles in scheduled or unscheduled revenue-producing services.
Recreational Trails Program (RTP) Provides funds to the States to develop and maintain recreational trails and trail-related facilities for motorized and nonmotorized recreational trail uses. 23 U.S.C. 206.
Restricted Road Public road with restricted public use. (DOI3)
Regional Railroad Railroad defined as line haul railroad operating at least 350 miles of track and/or earns revenue between $40 million and $266.7 million.
Reliability Refers to the degree of certainty and predictability in travel times on the transportation system. Reliable transportation systems offer some assurance of attaining a given destiĀ­nation within a reasonable range of an expected time. An unreliable transportation system is subject to unexpected delays, increasing costs for system users
Revenue Remuneration received by carriers for transportation activities.
Rural Mileage (Highway) Roads outside city, municipal district, or urban boundaries.
Remote Areas Sparsely populated areas such as mountains, swamps, and large bodies of water. (FAA8)
Revenue Aligned Budget Authority (RABA) The adjustment in funding made annually to the highway program, beginning in FY 2000, as a result of the adjustment in the firewall level for highways. The firewall level is adjusted to reflect revised receipt estimates for the Highway Account of the Highway Trust Fund. Then, adjustments equal to the firewall adjustment-are made to Federal-Aid highway authorizations and obligation limitation for the fiscal year.
Research and Special Programs Administration (RSPA) The Administration was established formally on September 23, 1977. It is responsible for hazardous materials transportation and pipeline safety, transportation emergency preparedness, safety training, multimodal transportation research and development activities, and collection and dissemination of air carrier economic data. It includes the Office of Hazardous Materials Safety; the Office of Pipeline Safety; the Office of Research Technology, and Analysis; the Office of University Research and Education; the Office of Automated Tariffs; the Office of Research Policy and Technology Transfer; the Volpe National Transportation Systems Center; and the Transportation Safety Institute. (OFR1)
Road Class The category of roads based on design, weatherability, their governmental designation, and the Department of Transportation functional classification system. (DOI3)
Road Functional Classification The classification of a road in accordance with the Bureau of Land Management (BLM) 9113.16. Code as follows C-collector, L-local, R-resource. (DOI2)
Right of Way The land (usually a strip) acquired for or devoted to highway transportation purposes. (FHWA2)
Rapid Rail Transit Transit service using railcars driven by electricity usually drawn from a third rail, configured for passenger traffic, and usually operated on exclusive rights-of-way. It generally uses longer trains and has longer station spacing than light rail.

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Updated: 03/21/2012
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