Recreation Access Advisory Committee: A committee established in 1993 by the U.S. Access Board to develop recommendations for accessible recreation facilities.

Recreation trail: A trail that is designed to provide a recreational experience.

Refreshable Braille Display: Hardware connected to a computer that echoes screen text on a box that has cells consisting of pins that move up and down to create Braille characters.

Rehabilitation Act of 1973: A federal law requiring nondiscrimination in the employment practices of Federal agencies of the executive branch and Federal contractors; requires all Federally assisted programs, services, and activities to be available to people with disabilities.

Removable obstacle: An item that obstructs the clear passage space but is not fixed immovably to the ground. Examples of removable objects include newspaper vending boxes, rocks, vegetation, trash receptacles, and small planters.

Repetitive Stress Injury (RSI): This disability may be chronic or acute and usually is described as pain caused by overuse of extremities, usually hands and wrists.

Rest area: A level portion of a trail that is wide enough to provide wheelchair users and others a place to rest and gain relief from the prevailing grade and cross slope demands of the path.

Rest area interval: The distance between rest areas.

Right-of-way: The rights, title, and interest in real property necessary for the construction and maintenance of the project. Private property rights may be acquired by donation or acquisition and may be fee-simple, easement, or other form of use agreement acceptable to the parties. The property rights must be of sufficient duration to match the design life of the project, and in a form that can be recorded on the land records.

Running cross slope: The average cross slope of a contiguous section of a sidewalk or trail. Running cross slope is measured by averaging the values of cross slope measurements taken periodically at different points along a given section of sidewalk.

Running grade: The average of many short, contiguous grades.

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