ISO/FDIS 8202

ISO/DISFDIS 8202
ISO/TC 22/SC 39
Secretariat: ANSI
Date: 2024-09-032025-06-10
Road vehicles — Box task and detection response task to measure
visual-manual and cognitive demand
Véhicules routiers — Mesure de la réponse à une demande visuelle-manuelle et cognitive
DISFDIS stage
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This document is not an ISO International Standard. It is distributed for review and comment. It is subject to change
without notice and may not be referred to as an International Standard.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which
they are aware and to provide supporting documentation.

ISO/DISFDIS 8202:2025(en)
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ISO/DISFDIS 8202:2025(en)
Contents
Foreword . iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Application of the box task (BT) and detection response task (DRT) . 4
5 Measurement setup. 5
5.1 Overview . 5
5.2 Box task equipment . 5
5.3 DRT equipment . 8
5.4 Documentation of setup . 8
6 Procedure . 8
6.1 Overview . 8
6.2 Participants . 9
6.3 Instructions . 9
6.4 Training procedure . 9
6.5 Dual-task conditions . 10
6.6 Baseline runs . 10
6.7 Calculation of performance metrics . 10
6.8 Analysing and interpreting differences between dual-task conditions . 10
Annex A (informative) Determination of angles of steering wheel and gas pedal deflection using
their own sensors . 11
Bibliography . 13

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ISO/DISFDIS 8202:2025(en)
Foreword
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ISO/DISFDIS 8202:2025(en)
Introduction
In the last years, the use of advanced in-vehicle information systems (IVIS) and smartphones while driving
has increased significantly. These systems are increasingly based on multimodal interaction and place
different dimensions of secondary-task demand while driving, for example, visual-manual and cognitive task
demand. Consequently, there is a high risk that the use of IVIS while driving may impair driving performance
and increase the risk of accidents. To minimize road safety issues, it is essential to assess the potential
secondary-task demand of IVIS as early as possible in the development process.
There are several different methods to assess secondary-task demand while driving. The occlusion method,
for example, is a standardized tool to assess visual secondary-task demand 0. The detection response task
(DRT), especially the tactile DRT, on the other hand, is a well-established method to estimate cognitive-task
demand. However, all methods can only measure specific dimensions of task demand. Therefore, a new
standardized method is recommended, one that reliably measures and differentiates between various
secondary-task demands.
The box task (BT) and DRT defined by this document can fill this gap. More precisely, the BT is intended to
measure visual-manual secondary-task demand. Additionally, in combination with a tactile DRT, cognitive
task demand can also be assessed. Hence, the BT + DRT represents an easy-to-use and cost-effective laboratory
method to differentiate between various dimensions and difficulty levels of secondary-task demand while
driving.
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ISO/DISFDIS 8202:2025(en)
Road vehicles — Box task and detection response task to measure
visual-manual and cognitive demand
1 Scope
This document describes a dynamic dual-task method that quantitatively measures human-performance
degradation on a primary driving-like task while a secondary task is being performed. The performance
measures of the method indicate the visual-manual and cognitive secondary-task demand associated with
visual-manual or auditory-verbal secondary task engagement while driving.
This document defines key terms and parameters for the assessment andof BT + DRT. It provides guidelines
and minimum requirements on equipment and procedures to plan evaluation trials, specify (and install) data
capture equipment, conduct a study, analyse, interpret, and report metrics indicating visual-manual and
cognitive secondary-task demand using the BT + DRT.
The metrics and definitions described in this document provide a common source of reference for the
assessment of visual-manual and cognitive task demand induced by different IVIS while driving. The BT + DRT
is applicable to standardized experiments in laboratory-based settings. Data collection and analyses according
to this document allow comparisons across different secondary tasks.
In contrast, this document does not apply to the measurement of primary (driving) task demand. This
document can be applied to both original equipment manufacturer (OEM) and after-market in-vehicle
systems, and to permanently installed as well as portable systems.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 17488, Road vehicles — Transport information and control systems — Detection-response task (DRT) for
assessing attentional effects of cognitive load in driving
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminologicalterminology databases for use in standardization at the following
addresses:
— IEC Electropedia: available at ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
3.1
baseline
test condition with the primary task (3.7)) only
[SOURCE: 0,, 2.2]
3.2
box task
BT
ISO/DISFDIS 8202:2025(en)
two-dimensional continuous tracking task (3.10)) simulating a car-following scenario where the driver has to
maintain the lane and the headway
Note 1 to entry: Within the box task , a dynamic box (3.13)) changes its lateral position (~ (lane maintenance) and size
(~ (headway to a lead vehicle) continuously.
Note 2 to entry: oneOne smaller and one larger static square is displayed in the middle of the screen as inner and outer
boundary (see 0 as an example).
Note 3 to entry: Participants have to adjust the box position and box size of the dynamic box by moving the steering wheel
and pressing the gas pedal and are instructed to keep the dynamic box within the boundaries.
Note 4 to entry: The box task () can be used in conjunction with the detection response task (3.4)) in order to assess visual-
manual and cognitive secondary-task demand (3.9.).
3.3
cognitive demand
demand for cognitive control imposed by a task (3.10))
[SOURCE: 0,, 3.6, modified — "cognitive load" was removed as a term.]
3.4
detection response task
DRT
task (3.10)) where participants respond to frequent artificial stimuli presented with a calibrated degree of
temporal uncertainty
Note 1 to entry: Detection performance, measured in terms of response time (3.21) and hit rate (3.20).).
Note 2 to entry: Detection performance is assumed to represent the degree to which attention is affected by the demand,
and in particular the cognitive demand (3.3load) component imposed by the secondary task (3.8)) under evaluation.
Note 3 to entry: The box task (3.2)) can be used in conjunction with the detection response task () in order to assess
visual-manual and cognitive secondary-task demand (3.9.).
3.5
dual task
two tasks (3.10)) concurrently performed, primarya primary task (3.7)) plus a secondary task (3.8))
[SOURCE: 0,, 2.6]
3.6
goal
system end state sought by the driver and which is meaningful in the context of a driver's use of an in-vehicle
system
[SOURCE: 0,, 2.8, modified — The example was deleted.]
3.7
primary task
driving or driving-like task (3.10)) used in the surrogate driving, driving simulator or on-road experimental
setup
Note 1 to entry: In the context of this current standarddocument, the box task (3.2)) (driving-like task used in the
surrogate driving) + DRT (3.4) is used as primary task.
ISO/DISFDIS 8202:2025(en)
[SOURCE: 0,, 3.18, modified — Note 1 to entry was added and "DRT experimental setups" has been replaced
by "experimental setup.]
3.8
secondary task
task (3.10)) that may be performed while driving but that is not concerned with the momentary real-time
control of the vehicle
[SOURCE: 0,, 3.
...