ISO 8202:2025
(Main)Road vehicles — Box task and detection response task to measure visual-manual and cognitive demand
Road vehicles — Box task and detection response task to measure visual-manual and cognitive demand
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 of 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 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.
Véhicules routiers — Mesure de la réponse à une demande visuelle-manuelle et cognitive
General Information
Standards Content (Sample)
International
Standard
ISO 8202
First edition
Road vehicles — Box task and
2025-09
detection response task to measure
visual-manual and cognitive demand
Véhicules routiers — Mesure de la réponse à une demande
visuelle-manuelle et cognitive
Reference number
© ISO 2025
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ii
Contents Page
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 . 4
5.1 Overview .4
5.2 Box task equipment .5
5.2.1 Display of visual driving scene .5
5.2.2 Steering wheel and gas pedal.5
5.2.3 Standard dynamics of driving scene .5
5.2.4 Experimental guidance on BT difficulty .6
5.2.5 Measurement recordings .6
5.3 DRT equipment .7
5.4 Documentation of setup .7
6 Procedure . 7
6.1 Overview .7
6.2 Participants .7
6.3 Instructions .7
6.4 Training procedure .8
6.5 Dual-task conditions . .8
6.6 Baseline runs .8
6.7 Calculation of performance metrics .8
6.7.1 Calculation of box task metrics .8
6.7.2 Calculation of DRT metrics .8
6.8 Analysing and interpreting differences between dual-task conditions .8
Annex A (informative) Determination of angles of steering wheel and gas pedal deflection
using their own sensors . 10
Bibliography .11
iii
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
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Ergonomics.
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iv
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,
[1]
for example, is a standardized tool to assess visual secondary-task demand ISO 16673 . 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.
v
International Standard ISO 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 of 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 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 terminology databases for use in standardization at the following addresses:
— 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
[2]
[SOURCE: ISO 26022:2010 , 2.2]
3.2
box task
BT
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: One smaller and one larger static square is displayed in the middle of the screen as inner and outer
boundary (see Figure 1 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
...
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