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https://nap.nationalacademies.org/catalog/27432/critical-issues-in-transportation-for-2024-and-beyond

Accessibility Challenges of Expansive Outside Spaces for Persons with Blindness or Visual Impairment: Effectiveness of Guidance Lines in Winter Conditions

Site design criteria for wide open spaces are often based on aesthetic concerns and safe crowd movements. These criteria consequently led the designers of the Montreal Place of Festivals to suggest levelling sidewalks and streets and prohibition of vehicle traffic during the warm season (six months). Use of guidance tiles has been proposed and its relevance examined by the Accessibility Committee since blind people were losing cues normally used for traveling in a straight line and for localizing street corners. Though many countries install tactile surfaces in such areas in order to facilitate travel by the blind or visually impaired persons, the effectiveness of these surfaces in cities with long winter periods has not been demonstrated. Also, guidance lines have not yet been applied in North America. This pilot project intended to test the effectiveness of this type of application in winter conditions. The objectives of the project were (1) to assess the capability of a blind person to maintain a straight line of travel by shorelining guidance tiles in a winter situation, (2) to document the usefulness of the attention field in identifying an intersecting passageway composed of guidance tiles, and (3) to identify strategies used by participants while shorelining the tiles. A testing site has been installed in a wide open space surrounding a major subway station. Guidance tiles (polymer, 300mm wide), were casted-in place in two T-shape passageways. An attention field (600mm X 600 mm) composed of truncated domes has been installed at the intersection of one T-shape passageway. The experimentation was conducted during cold days, tiles and adjacent areas were covered by snow. Two groups of participants were recruited. Group one was composed of 24 cane user blind adults and group two was composed of 12 O&M specialists wearing a blindfold. Each participant had to perform four tasks: (1) detect the starting point of a guidance pathway from a street corner, establish contact with the pathway and shoreline it over a 5-meter long route, (2) execute a L-shape route having an attention field only as a cue to identify the intersecting passageway, (3) execute a L-shape having an attention field and the perpendicular passageway as cues, and (4) execute the L-shape route having only the perpendicular guidance pathway as a cue. Strategies used by participants were noted. An appreciation questionnaire was submitted following completion of the tasks. Preliminary results seem to indicate that tiles were difficult to detect and to shoreline when covered by snow. Results from task one indicate that 55% of participants succeeded in detecting the pathway and in establishing and maintaining contact over 5 meters. With regard to tasks 2, 3, and 4, the results were respectively 39%, 25%, and 17% with a criterion success of 3 successful L-route executions over 4. Detection of the intersecting pathway was the main issue independently of the cue offered. Feet placement and cane strategies were various. Participants reported that use of guidance tiles was tiring and not effective during winter. However, participants expressed their appreciation for the use of this design in more clement seasons.

Language

  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; References;
  • Pagination: 11p
  • Monograph Title: TRANSED 2010: 12th International Conference on Mobility and Transport for Elderly and Disabled Persons, June 1-4, 2010

Subject/Index Terms

Filing Info

  • Accession Number: 01360824
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jan 25 2012 11:57AM