Shared use path: A trail that permits more than one type of user and that has a transportation and recreation function. An example is a trail designated for use by both pedestrians and bicyclists.

Shy distance: The area along a path generally avoided by pedestrians, such as the areas closest to buildings, retaining walls, curbs, and fences.

Sidewalk: The portion of a highway, road, or street intended for pedestrians.

Sidewalk approach: The section of the sidewalk that flanks the landing of a curb ramp. The approach may be slightly graded if the landing level is below the elevation of the adjoining sidewalk.

Sight distance: The length of roadway visible to a driver or pedestrian; the distance a person can see along an unobstructed line of sight.

Sign language: This term is used to denote a number of different manual systems of communication used by deaf people. In addition to ASL, each country has its own distinct sign language. There are also a number of invented sign languages, such as Signed Exact English (SEE), Pidgin Signed English, and Cued Speech. There is also an International Sign Language used by some deaf people to communicate with deaf people from other countries.  See also: American Sign Language

Site: A parcel of land bounded by a property line or a designated portion of public right of way.

Slip resistant surface: Slip resistance is based on the frictional force necessary to permit a person to ambulate without slipping. A slip resistant surface does not allow a shoe heel, wheelchair tires, or a crutch tip to slip when ambulating on the surface.

Specific Learning Disability: Disorder in one or more of the basic psychological processes involved in understanding or in using language, spoken or written, which may manifest itself in difficulties listening, thinking, speaking, reading, writing, spelling, or doing mathematical calculations. Frequent limitations include hyperactivity, distractibility, emotional instability, visual and/or auditory perception difficulties and/or motor limitations, depending on the type(s) of learning disability.

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