USE OF VISUAL OCCLUSIONTO ASSESS IN-VEHICLE HMI

Dean P. ChiangDynamic Research, Inc., Torrance, CA

22 May 2003ITS America Annual Meeting, Minneapolis

Session 68b

ITSA 2003-68b 2

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 2003-68b 3

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 2003-68b 4

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 2003-1-0128

ITSA 2003-68b 5

SIMULATOR SETUP

Roadway Scene

Secondary Task Touch Screen Layout

ITSA 2003-68b 6

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 2003-68b 7

EFFECT OF PRIMARY TASK OCCLUSION TIME ON LANE KEEPING PERFORMANCE

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

0 1 2 3 4

Occlusion Time (sec)

Std.

Dev

. of

Lane

Pos

ition

(m)

Duration

30 sec

60 sec

120 sec

ITSA 2003-68b 8

LANE KEEPING PERFORMANCE FORSUCCESSIVE RUN SEGMENTS

0.00

0.05

0.10

0.15

0.20

0.25

0.30

0.35

0.40

0 20 40 60 80 100 120

Run Duration (sec)

Std

. D

ev. of

Lan

e Pos

itio

n (m

)

Task

60 / 2 (1)

60 / 2 (2)

120 / 1

ITSA 2003-68b 9

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 2003-68b 10

CONTACT INFORMATION

Dean P. ChiangTechnical Director(310) 212-5211 dpc@dynres.com