ISO INTERNATIONAL STANDARD 23599 Secondedition 2019-01 Assistive products for blind and vision-impaired persons Tactile walking surface indicators Produits d'assistancepourpersonnes aveugles ou visuellement affaiblies - Indicateurs tactiles de surfaces de marche Reference number IS0 23599:2019(E) so @ IS0 2019 IS0 23599:2019(E) COPYRIGHTPROTECTEDDOCUMENT @ ISO 2019 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either IsO at the address below or Iso's member body in the country of the requester. ISO copyright office CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +4122 749 0111 Fax: +41 22 749 09 47 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2019 - All rights reserved IS0 23599:2019(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. 2 Normative references ..1 3 Terms and definitions ..1 4 General provisions. .3 4.1 General principles 3 4.2 Detecting and distinguishing TWSIs ..4 4.2.1 General. .4 4.2.2 Tactile contrast ..4 4.2.3 Visual contrast 4 4.2.4 Design for prevention of tripping .4 5 Reguirementsandrecommendations ..4 5.1 Specifications for shape and dimensions of TwSIs 4 5.1.1 General. ..4 5.1.2 Attention patterns .5 5.1.3 Guiding patterns. .6 5.2 Surrounding or adjacent surfaces 10 5.3 Visual contrast. .10 5.3.1 General. ..10 5.3.2 Luminance contrast. .10 5.3.3 Calculation of the luminance contrast value 11 5.3.4 Maintenance of minimum luminance contrast 11 5.3.5 Measurement condition 11 5.3.6 Difference in colour or tone .11 5.3.7 Illumination .11 5.4 Materials. .11 5.5 Installation .12 5.5.1 General. 12 5.5.2 Principles for installation of TWSIs. .12 5.5.3 Principles for installation of attention patterns ..12 5.5.4 Principles for installation of guiding patterns .13 Annex A (informative) Luminance contrast ..14 Annex B (informative) Examples of installations of TwSIs in specific situations .17 Bibliography .38 @ IS0 2019 - All rights reserved iii