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36 CFR Part 1190, Proposed Accessibility Guidelines for Pedestrian Facilities in the Public Right-of-Way: Notice of Proposed Rulemaking (NPRM)

R103 Conventions

R103.1 Conventional Industry Tolerances. Dimensions are subject to conventional industry tolerances except where dimensions are stated as a range.

Advisory R103.1 Conventional Industry Tolerances. Conventional industry tolerances include tolerances for field conditions and tolerances that may be a necessary consequence of a particular manufacturing process. Conventional industry tolerances do not apply to design work.

R103.2 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 is permitted.

Dimension lines showing International System of Units (in millimeters unless otherwise noted) above the line of US customary units (in inches unless otherwise noted) below. 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. 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.

R103.3 Units of Measurement. Measurements are stated in metric and U.S. customary units. The values stated in each system (metric and U.S. customary units) may not be exact equivalents, and each system shall be used independently of the other.

Advisory R103.3 Units of Measurement. Users should work entirely within one system of measurement, either metric or U.S. customary units. Combining values from the two systems may result in non-compliance.

Source: 36 CFR Part 1190, Proposed Accessibility Guidelines for Pedestrian Facilities in the Public Right-of-Way: Notice of Proposed Rulemaking (NPRM) by U.S. Access Board - published 07/26/2011

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