USE OF VISUAL OCCLUSION TO ASSESS IN-VEHICLE HMI Dean P. Chiang Dynamic Research, Inc., Torrance, CA 22 May 2003 ITS America Annual Meeting, Minneapolis Session 68b

ITSA b2 INTRODUCTION Interest in driver distraction Recent efforts to establish guidelines and evaluation procedures SAE Recommended Practice J2364 AAM Guidelines ISO TC22/SC13/WG8 work item Issues include: Test procedures Occlusion parameters Task time

ITSA b3 LITERATURE AND DATA Some contemporary driver behavior and performance data Recent studies provided results for driver paced use of in- vehicle HMI; corresponds to real-world conditions without occlusion WG8 Occlusion Workshop 11/01 provided useful benchmark

ITSA b4 DRI OCCLUSION STUDY Primary task only, with occlusion Secondary task only, with occlusion Varied occlusion parameters to determine preferred boundary values Occlusion goggles vs. screen blanking methods Effect of task duration on driver performance and glance behavior Some details in SAE paper

ITSA b5 SIMULATOR SETUP Roadway Scene Secondary Task Touch Screen Layout

ITSA b6 EXPERIMENTAL PROCEDURES Drive in a safe manner Maintain position in lane center Maintain prescribed speed Primary task more important than secondary task Accurate entry more important than fast entry 18 Ss: 9F/9M, 40 avg. age

ITSA b7 EFFECT OF PRIMARY TASK OCCLUSION TIME ON LANE KEEPING PERFORMANCE

ITSA b8 LANE KEEPING PERFORMANCE FOR SUCCESSIVE RUN SEGMENTS

ITSA b9 OVERALL RESULTS OPEN times of 1.5 sec or greater provide satisfactory secondary task performance CLOSE times greater than 2 sec correspond to poor primary task performance Secondary task CLOSED times of 1-3 sec are acceptable No clear preference for screen blanking or goggles Relatively long secondary task durations (up to 1-2 min) do not degrade primary and secondary task performance, behavior, or ratings

ITSA b10 CONTACT INFORMATION Dean P. Chiang Technical Director (310)