TECHNICAL ISO/TR REPORT 21974-1 Firstedition 2018-11 Naturalistic driving studies - Vocabulary - Part 1: Safety critical events Etudes naturalistiques de conduite - Vocabulaire - Partie 1: Evenements critiques de sécurite Reference number IS0/TR21974-1:2018(E) ISO @IS02018 IS0/TR 21974-1:2018(E) COPYRIGHTPROTECTEDDOCUMENT @ IS0 2018 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: copyright@iso.org Website: www.iso.org Published in Switzerland ii @ IS0 2018 - All rights reserved IS0/TR 21974-1:2018(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. ..1 2 Normative references ..1 3 Terms and definitions Annex A (informative) Conceptual Framework for Categorizing Safety-critical events (SCEs) in Naturalistic Driving Data 5 Annex B (informative) Principles of Conflict Classification .11 Annex C (informative) Additional Conflict Attributes .28 Bibliography .52 @ IS0 2018 - All rights reserved iii