ISO/TS 14198:2019

TECHNICAL ISO/TS
SPECIFICATION 14198
Second edition
2019-04
Road vehicles — Ergonomic aspects
of transport information and control
systems — Calibration tasks for
methods which assess driver demand
due to the use of in-vehicle systems
Véhicules routiers — Aspects ergonomiques des systèmes
d'information et de contrôle du transport — Tâches de calibration
pour méthodes qui évaluent la distraction du conducteur due à
l'utilisation des systèmes embarqués
Reference number
©
ISO 2019
© ISO 2019
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ii © ISO 2019 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Abbreviated terms . 3
5 Calibration tasks . 4
5.1 Principle and overview . 4
5.2 Types of calibration tasks . 4
5.3 Critical Tracking Task (CTT). 4
5.3.1 Description . . . 4
5.3.2 Operation of the CTT . 5
5.3.3 Setup for CTT . 6
5.3.4 Test conditions for CTT . 6
5.3.5 Participants for CTT . 6
5.3.6 Participant instruction for CTT . 6
5.3.7 Practice trials . 7
5.3.8 Test metrics . 7
5.4 Surrogate Reference Task (SURT) . 7
5.4.1 Description . . . 7
5.4.2 Setup for SURT . 8
5.4.3 Test conditions for SURT . 9
5.4.4 Participants for SURT . . 9
5.4.5 Participant instructions for SURT . 9
5.4.6 Practice trials .10
5.4.7 Test metrics .10
5.5 N-back .10
5.5.1 Description . . .10
5.5.2 Operation of the n-back .10
5.5.3 Setup for n-back .11
5.5.4 Test conditions for n-back .11
5.5.5 Participants for n-back .11
5.5.6 Participant instruction for n-back .11
5.5.7 Practice trials .12
5.5.8 Test metrics .12
6 Calibration criterion .12
6.1 Calibration criterion procedure .12
6.2 General calibration considerations .14
Annex A (informative) Calibration task setup details using the LCT .15
Annex B (informative) Multi-lab reference data for LCT .17
Annex C (informative) Calibration task setup details using the DRT .19
Annex D (informative) Multi-lab reference data for DRT .20
Bibliography .22
Foreword
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electrotechnical standardization.
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described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
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.org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 39,
Ergonomics.
This second edition cancels and replaces the first edition (ISO/TS 14198:2012), which has been
technically revised. The main changes compared to the previous edition are as follows:
— in addition to the Lane Change Test (LCT), the Detection Response Task (DRT) is added as a
primary task;
— in addition to the Critical Tracking Task (CTT) and Surrogate Reference Task (SURT), the n-back
task is added as calibration task.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/members .html.
iv © ISO 2019 – All rights reserved

Introduction
The number of standardized methods to assess driver attentional demand due to the use of in-vehicle
information and communication devices is continuing to increase. In applying these methodologies, it is
important to understand and document variability in participants’ performance of standard calibration
tasks and procedures across laboratories and/or time.
A suitable calibration task should have the following attributes:
— It should be robust against the variations in cultural background of participants.
— Properly applied, the task should give repeatable quantitative results. It should be sensitive to
inappropriate variations in participants, equipment, location, experimenter and instruction.
— It should use durable and readily available equipment for conducting the task.
— It should apply to the driver population and be usable in a driving-like context.
A standardized calibration task can be used to produce a range of statistically stable, repeatable and
comparable secondary task demands for a participant in an experimental setting. This setting can be
used to assess the effect on driving performance of the attentional demand due to driver interaction
with an information, entertainment, and control or communication system while a vehicle is in motion.
Different calibration tasks are specified in this document to cover calibration manual, visual, and
cognitive aspects of various secondary task characteristics.
TECHNICAL SPECIFICATION ISO/TS 14198:2019(E)
Road vehicles — Ergonomic aspects of transport
information and control systems — Calibration tasks for
methods which assess driver demand due to the use of in-
vehicle systems
1 Scope
This document provides procedures that can be used as a secondary task in a dual task setting to
determine whether that evaluation setting is standardized and valid for purposes of assessing driver
attentional demand due to the use of an in-vehicle system. This document does not define calibration
procedures for other evaluation activities that a laboratory might undertake.
This document provides guidance on selecting a calibration task given a specific primary task. The
primary tasks of interest include those that would be used in the evaluation of attentional demand.
Such primary tasks are defined in other documents.
The description of a calibration task includes its application, experimental setup, data collection, and
procedures for analysis of results.
The purpose of this document is not to define a reference criterion as to whether a given second
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