T101  Purpose

This document contains scoping and technical requirements for accessibility to outdoor developed areas by individuals with disabilities.  These requirements are to be applied during the design, construction, additions to, and alterations of outdoor developed areas by Federal agencies when adopted as standards pursuant to the Architectural Barriers Act.

Advisory T101  Purpose.  It is recognized that compliance with this document may not necessarily result in an accessible facility for all persons with disabilities.  The intent is to ensure that accessibility is considered for all newly constructed and altered trails and other outdoor elements, recognizing that natural environments may not always be compatible with fully accessible facilities.
T102  Modifications and Waivers

The Architectural Barriers Act authorizes the Administrator of the General Services Administration, the Secretary of the Department of Housing and Urban Development, the Secretary of the Department of Defense, and the United States Postal Service to modify or waive the accessibility standards for facilities covered by the Architectural Barriers Act on a case-by-case basis, upon application made by the head of the department, agency, or instrumentality of the United States concerned.  The General Services Administration, the Department of Housing and Urban Development, the Department of Defense, and the United States Postal Service may grant a modification or waiver only upon a determination that it is clearly necessary.  Section 502(b)(1) of the Rehabilitation Act of 1973 authorizes the Access Board to ensure that modifications and waivers are based on findings of fact and are not inconsistent with the Architectural Barriers Act.

T103 Conventions

T103.1 Dimensions.  Dimensions that are not stated as “maximum” or “minimum” are absolute.

T103.1.1  Construction and Manufacturing Tolerances.  All dimensions are subject to conventional industry tolerances except where the requirement is stated as a range with specific minimum and maximum end points.

T103.2  Calculation of Percentages.  Where the required number of elements or facilities to be provided is determined by calculations of ratios or percentages and remainders or fractions result, the next greater whole number of such elements or facilities shall be provided.  Where the determination of the required size or dimension of an element or facility involves ratios or percentages, rounding down for values less than one half shall be permitted.

T103.3 Figures.  Unless specifically stated otherwise, figures are provided for informational purposes only.

Figure T103
Graphic Convention for Figures
Dimension lines show English units above the line (in inches unless otherwise noted) and the SI units (in millimeters unless otherwise noted).  Small measurements show the dimension with an arrow pointing to the dimension line.  Dimension ranges are shown above the line in inches and below the line in millimeters.  Min refers to minimum, and max refers to the maximum.  Mathematical symbols indicate greater than, greater than or equal to, less than, and less than or equal to.  A dashed line identifies the boundary of clear floor space or maneuvering space.  A line with alternating shot and long dashes with a c and l at the end indicate the centerline.  A dashed line with longer spaces indicates a permitted element or its extension.  An arrow is to identify the direction of travel or approach.  A thick black line is used to represent a wall, floor, ceiling or other element cut in section or plan.  Gray shading is used to show an element in elevation or plan.  Hatching is used to show the location zone of elements, controls, or features.
T104  Definitions

T104.1  General.  For the purpose of this document, the terms defined in T104.4 have the indicated meaning.

T104.2  Undefined Terms.  The meaning of terms not specifically defined in T104.4 or in regulations issued by Federal agencies shall be as defined by collegiate dictionaries in the sense that the context implies.

T104.3  Interchangeability.  Words, terms and phrases used in the singular include the plural and those used in the plural include the singular.

T104.4  Defined Terms

Alteration.  A change to a facility or site that affects or could affect the usability of the facility or site or portion thereof.  Normal maintenance and repair, including but not limited to removal of debris and maintenance of a trail head structure are not alterations unless they affect the usability of the facility or site.

Beach Access Route.  A continuous unobstructed path designated for pedestrian use that crosses the surface of the beach.

Designated Trailhead.  A designated point of access that may contain a parking area, information kiosks, restrooms, water hydrants, and may be reached by vehicular or pedestrian access.

Facility.  All or any portion of buildings, structures, site improvements, elements and pedestrian routes or vehicular ways located on a site.

Outdoor Recreation Access Route.  A continuous unobstructed path designated for pedestrian use that connects accessible elements within a picnic area, camping area, or designated trailhead.

Trail.  A route that is designed, constructed, or designated for recreational pedestrian use or provided as an pedestrian alternative to vehicular routes within a transportation system.

Tread Width.  The path or visible trail surface perpendicular to the direction of travel.  The clear tread width of the trail is the width of the usable trail tread, measured perpendicular to the direction of travel and on or parallel to the surface of the usable trail tread.  The minimum clear tread width is the narrowest measurement on the usable trail tread.