RAIL STATION: Facility where passengers may board a type of rail service which may be Metrorail, light rail, commuter rail, or some other form of rail passenger service. Facility typically includes passenger waiting, ticketing and information areas. Rail stations also designated as a transit transfer center will not have commuter parking while those also designated as a commuter parking lot will have commuter parking.

REDEVELOPMENT: Development activity generally characterized by clearance of existing structures and new construction. The new development may be the same type of land use, or a new type, but it is usually at a higher level of intensity or density than that it replaces.

REGIONAL LIBRARIES: Large facilities offering a comprehensive collection of materials and a variety of services and programs. Such facilities are the foundation of the County's library system and are supported by the other two facility categories. Monthly circulation level is at least 50,000 volumes.

REGIONAL PARKS: Parks that are distinguished from, yet supplement and enhance County and municipal park systems, and seek to preserve and protect regionally-significant areas of particular ecological, scenic or historic value and provide recreational facilities to serve users throughout the Northern Virginia area.

REGIONAL STORMWATER MANAGEMENT FACILITIES: A regional stormwater management facility is defined as a facility that provides detention of stormwater runoff typically for the entire upstream watershed and provides water quality benefits for the entire upstream watershed in accordance with the Public Facilities Manual. Generally for a stormwater detention facility to qualify as a regional facility, it must provide detention benefits for a watershed area of greater than 100 acres.

RESOURCE-BASED PARKS: Parks that primarily preserve, protect and interpret significant or exemplary environmental, ecological, cultural and/or scenic resources and areas for public education, enjoyment, and use consistent with resource protection and stewardship needs.

RESOURCE MANAGEMENT AREA (RMA): An area designated pursuant to the Chesapeake Bay Preservation Ordinance (Chapter 118 of the Fairfax County Code) comprised of lands that, if improperly used or developed, have a potential for causing significant water quality degradation or for diminishing the functional value of the Resource Protection Area. RMAs include any such area that is not designated as an RPA.

RESOURCE PROTECTION AREA (RPA): An area designated pursuant to the Chesapeake Bay Preservation Ordinance (Chapter 118 of the Fairfax County Code) comprised of lands at or near the shoreline or water's edge that have an intrinsic water quality value due to the ecological and biological processes they perform or are sensitive to impacts which may result in significant degradation of the quality of state waters. In their natural condition, these lands provide for the removal, reduction, or assimilation of sediments, nutrients, and potentially harmful or toxic substances from runoff entering the Bay and its tributaries, and minimize the adverse effects of human activities on state waters and aquatic resources.

REVETMENT: A man-made slope that is constructed along a shoreline and protected through the placement of erosion-resistant materials, typically separate layers of stone or chunks of concrete (known as "riprap"), sometimes along with filter fabric that is effective in preventing erosion from occurring behind the riprap.

REVITALIZATION: The renewal and improvement of older commercial and residential areas through any of a series of actions or programs that encourage and facilitate private and public investment. This community investment can include (but is not limited to) activities and programs designed to improve neighborhoods; strengthen existing businesses; attract new businesses; encourage quality renovation and new construction; enhance public spaces and pedestrian amenities; ensure safe, efficient and convenient traffic flow; and contribute to the social and economic vitality of the area.

RIDESHARING: Programs designed to increase the occupancy of automobiles, or other vehicles, and thereby reduce demand on the roadway system. Examples include carpooling, vanpooling, buspooling, and promotion of the use of High Occupancy Vehicle (HOV) facilities.

RIGHT OF WAY: The area over which a legal right of passage exists; land used for public purposes in association with the construction or provision of public facilities, transportation projects, or other infrastructure.