1、Standard Specification for Detectable Warning Surfaces AASHTO Designation: M 333-161Release: Group 2 (June 2016) American Association of State Highway and Transportation Officials 444 North Capitol Street N.W., Suite 249 Washington, D.C. 20001 TS-4d M 333-1 AASHTO Standard Specification for Detectab
2、le Warning Surfaces AASHTO Designation: M 333-161Release: Group 2 (June 2016) 1. SCOPE 1.1. Detectable warnings provide a distinctive surface of truncated domes detectable by cane or underfoot to alert people with vision impairments of the transition to vehicular ways. These warnings compensate for
3、the sloped surfaces of curb ramps that remove a tactile cue provided by curb faces. 1.2. It is not the intent of this specification to relieve the supplier from the final responsibility to provide an appropriate product for the intended function, nor is it intended to specify all the design details.
4、 The objective is to provide a sufficiently detailed specification such that the function establishes a standard geometry of the detectable warning surface. 2. REFERENCED DOCUMENTS 2.1. The United States Access Board, Guidelines and Standards, Streets and Sidewalks, Public Rights-of-Way. www.access-
5、board.gov/guidelines-and-standards/streets-sidewalks/public-rights-of-way 3. TERMINOLOGY 3.1. detectable warningA surface feature built in or applied to walking surfaces or other elements to warn of hazards on a circulation path. 4. DETECTABLE WARNING SURFACES 4.1. GeneralDetectable warnings shall c
6、onsist of a surface of truncated domes aligned in a square or radial grid pattern and shall comply with the following requirements: 4.1.1. Dome SizeTruncated domes in a detectable warning surface shall have a base diameter of 0.9 in. (23 mm) minimum to 1.4 in. (36 mm) maximum, a top diameter of 50 p
7、ercent of the base diameter minimum to 65 percent of the base diameter maximum, and a height of 0.2 in. (5 mm). 4.1.2. Dome SpacingTruncated domes in a detectable warning surface shall have a center-to-center spacing of 1.6 in. (41 mm) minimum and 2.4 in. (61 mm) maximum, and a base-to-base spacing
8、of 0.65 in. (16 mm) minimum, measured between the most adjacent domes. 4.1.3. ContrastDetectable warning surfaces shall contrast visually with adjacent walking surfaces either light-on-dark or dark-on-light. 4.1.4. SizeDetectable warning surfaces shall extend 24 in. (610 mm) minimum in the direction
9、 of travel and the full width of the curb ramp, landing, or blended transition. 2016 by the American Association of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.TS-4d M 333-2 AASHTO 4.2. LocationThe detectable warning surface shall be
10、located as specified by public right-of-way accessibility guidelines (PROWAG). 1Formerly AASHTO Provisional Standard MP 12. First published as a full standard in 2015. 2016 by the American Association of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.
