ISO/PAS 21779-1:2025

Road vehicles - Test method to evaluate the performance of acceleration control pedal error (ACPE) - Part 1: Car-to-car from standstill

This document specifies test methods to evaluate the behaviour of a vehicle equipped with an acceleration control pedal error (ACPE) system according to ISO/PAS 19486. Those forward and reverse accidents occur during a straight-line acceleration when the vehicle under test (VUT) accelerates due to driver misapplication of accelerator pedal instead of intended brake pedal. This document is limited to ACPE systems of light vehicles only classified in UN-ECE (TRANS/WP.29/1045) Vehicle: “Category 1-1 vehicle” and does not apply to such devices installed in vehicles of other categories, such as heavy vehicles or motorcycles. This document focuses on an important part of the vehicle behaviour during these collision scenarios, which is the capacity to avoid or mitigate the collision especially to the other vehicle.

Véhicules routiers — Méthode d'essai pour évaluer la performance du contrôle de l'accélération en cas d'erreur de pédale (ACPE) — Partie 1: Véhicule-véhicule à partir de l'arrêt

General Information

• Status: Published
• Publication Date: 26-May-2025
• ICS: 35.240.60 - IT applications in transport
• ICS: 43.040.15 - Car informatics. On board computer systems
• Technical Committee: ISO/TC 22/SC 33 - Vehicle dynamics and chassis components
• Drafting Committee: ISO/TC 22/SC 33/WG 3 - Driver assistance and active safety functions
• Current Stage: 6060 - International Standard published
• Start Date: 27-May-2025
• Due Date: 06-Dec-2026
• Completion Date: 27-May-2025

Overview

ISO/PAS 21779-1:2025 - "Road vehicles - Test method to evaluate the performance of acceleration control pedal error (ACPE) - Part 1: Car-to-car from standstill" specifies standardized test methods to assess how a light vehicle equipped with an Acceleration Control Pedal Error (ACPE) system behaves when a driver unintentionally depresses the accelerator instead of the brake during straight-line start-up. The document is limited to light vehicles (UN‑ECE Category 1‑1) and focuses on the vehicle’s capacity to avoid or mitigate collisions with another vehicle from a standstill.

Key topics and technical requirements

• Scope and definitions: terms such as VUT (Vehicle Under Test), EVT (Equivalent Vehicle Target), virtual collision location and distance metrics are defined to ensure consistent testing.
• Test conditions: specification of vehicle state (mass at delivery, load condition), tyre and braking system requirements, engine and drivetrain settings, and ACPE device configuration.
• Test environment: requirements for test track layout, reference and target tracks, weather and visibility constraints, allowable wind and temperature ranges, and conditions for test omission.
• Measurement and instrumentation: required measurement items, equipment placement, and data capture (including video/image records) to document outcomes.
• Test procedure: step-by-step preparation (initialization, break‑in), setup of starting positions, brake temperature control, EVT placement, transmission settings, number of runs, and re‑break‑in procedures.
• Result validation and records: arrangement of measurement data, confirmation of test validity, recording environmental conditions, and reporting of test outcomes.
• Normative annexes: vehicle/ACPE condition specifications and example performance test results to support interpretation.

Applications and users

ISO/PAS 21779-1 is intended for:

• OEMs and component suppliers validating ACPE functionality during vehicle development.
• Independent test laboratories performing standardized performance evaluations.
• Regulatory and homologation bodies that assess low‑speed collision mitigation features.
• Safety engineers and researchers studying pedal misapplication scenarios and mitigation strategies. Practical use cases include design verification, compliance testing, ADAS integration checks, safety benchmarking, and consumer protection testing.

Related standards and references

• ISO/PAS 19486 (ACPE system definition)
• ISO 8855 (vehicle dynamics vocabulary)
• ISO 15037-1 (vehicle dynamics test conditions)
• ISO 19206-1 and ISO 19206-3 (test devices and targets)
• JASO C307 and UN‑ECE guidance (TRANS/WP.29/1045) are referenced for context and harmonization.

Keywords: ISO/PAS 21779-1, ACPE, acceleration control pedal error, vehicle test method, VUT, EVT, light vehicles, pedal misapplication, collision mitigation, automotive safety testing.

Standards Content (Sample)

Publicly
Available
Specification
ISO/PAS 21779-1
First edition
Road vehicles — Test method
2025-05
to evaluate the performance of
acceleration control pedal error
(ACPE) —
Part 1:
Car-to-car from standstill
Véhicules routiers — Méthode d'essai pour évaluer la
performance du contrôle de l'accélération en cas d'erreur de
pédale (ACPE) —
Partie 1: Véhicule-véhicule à partir de l'arrêt
Reference number
© ISO 2025
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Published in Switzerland
ii
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Basic concept of the test . 3
5 Test conditions . 3
5.1 General .3
5.2 General data .3
5.3 Specifications of test vehicle .3
5.4 State of test vehicle .3
5.4.1 General .3
5.4.2 Load condition .4
5.4.3 Tyres .4
5.4.4 Braking system .4
5.4.5 Drive shaft .4
5.4.6 Engine setting, power character .4
5.4.7 Protection device .4
5.4.8 Setting of the ACPE device .4
5.5 Test course .4
5.5.1 Test track .4
5.5.2 Environment .5
5.6 Weather conditions .5
5.6.1 Temperature .5
5.6.2 Wind speed .5
5.6.3 Visibility .5
5.6.4 Conditions for test omission .5
5.7 Measurement items .5
5.8 Measurement equipment.5
6 Test method . 6
6.1 Test preparation .6
6.1.1 Initialization work .6
6.1.2 Break-in driving .6
6.1.3 Selection of test conditions .6
6.2 Testing .7
6.2.1 Rebreaking in .7
6.2.2 Setup of starting position of test driving .7
6.2.3 Brake temperature .7
6.2.4 EVT placement.7
6.2.5 Transmission .7
6.2.6 Moving to the starting position of test driving .7
6.2.7 Preparation at the starting point of test driving .7
6.2.8 Test driving .8
6.2.9 Number of tests .8
6.3 Confirmation of test results and record of test image .8
6.3.1 Measurement section .8
6.3.2 Arrangement of measurement data .8
6.3.3 Record of test image .8
6.3.4 Test validity confirmation .9
7 Records of test results . 9
7.1 Record of environmental conditions and others.9
7.2 Record of measurement values .9

iii
7.3 Test outcomes .9
Annex A (normative) Conditions of ACPE and specifications of the test vehicle .10
Annex B (normative) Performance test results of ACPE.11
Bibliography .13

iv
Foreword
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This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 33, Vehicle
dynamics, chassis components and driving automation systems testing.
A list of all parts in the ISO 21779 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
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v
Introduction
The aim of the acceleration control for pedal error (ACPE) is to prevent a car accident at a low speed due to
driver’s pedal misapplication. The standard of the system definition is developed on ISO/PAS 19486, and
this document is intended to assess the complete performance of ACPE fitted in a road vehicle based on JASO
C307 published in 2023.
vi
Publicly Available Specification ISO/PAS 21779-1:2025(en)
Road vehicles — Test method to evaluate the performance of
acceleration control pedal error (ACPE) —
Part 1:
Car-to-car from standstill
1 Scope
This document specifies test methods to evaluate the behaviour of a vehicle equipped with an acceleration
control pedal error (ACPE) system according to ISO/PAS 19486. Those forward and reverse accidents occur
during a straight-line acceleration when the vehicle under test (VUT) accelerates due to driver misapplication
of accelerator pedal instead of intended brake pedal. This document is limited to ACPE systems of light
vehicles only classified in UN-ECE (TRANS/WP.29/1045) Vehicle: “Category 1-1 vehicle” and does not
apply to such devices installed in vehicles of other categories, such as heavy vehicles or motorcycles. This
document focuses on an important part of the vehicle behaviour during these collision scenarios, which is
the capacity to avoid or mitigate the collision especially to the other vehicle.
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 8855, Road vehicles — Vehicle dynamics and road-holding ability — Vocabulary
ISO 15037-1:2019, Road vehicles — Vehicle dynamics test methods — Part 1: General conditions for passenger cars
ISO 19206-1, Road vehicles — Test devices for target vehicles, vulnerable road users and other objects, for
assessment of active safety functions — Part 1: Requirements for passenger vehicle rear-end targets
ISO 19206-3, Road vehicles — Test devices for target vehicles, vulnerable road users and other objects, for
assessment of active safety functions — Part 3: Requirements for passenger vehicle 3D targets
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 8855, ISO 15037-1, ISO 19206-1,
ISO 19206-3 and the following 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
reference track
target track for a test vehicle
3.2
vehicle mass at the time of delivery
mass of the test vehicle, which is loaded with full capacity of fuel, lubricating oil, cooling water, etc. in the
motor and fuel systems, including vehicle-mounted tools, spare tyres and other standard equipment

3.3
brake temperature before test driving
highest temperature of the brake linings/pads of each wheel of the test vehicle to be measured while the test
vehicle is stationary immediately before starting each test run
3.4
EVT
equivalent vehicle target
vehicle target designed to be detectable by sensors
Note 1 to entry: Such sensors are, for example, lidar, millimetre wave radar, cameras able to detect a typical segment-C
passenger car.
3.5
VUT
vehicle under test
vehicle tested with the accelerator pedal control error (APCE) system
3.6
virtual collision location
location where a collision is assumed to occur on the reference track (3.1)
Note 1 to entry: See Figure 1.
3.7
distance from the virtual collision location
d
distance between the virtual collision location (3.6) on the reference track (3.1) and the front-centre (for F
off
or F testing in Table 1) or back-centre (for R or R testing in Table 1) of the vehicle under test (VUT) (3.5)
on off on
Note 1 to entry: See Figure 1.
3.8
lateral deviation amount
amount of lateral shift of the front-centre of the vehicle under test (VUT) (3.5) relative to the reference track (3.1)
Note 1 to entry: See Figure 1.
3.9
braking-off
point when the foot of the driver of the vehicle under test (VUT) (3.5) is not pressed and removed from the
brake pedal during the test driving
3.10
accelerator-on
point when the accelerator pedal starts moving during the test driving
3.11
accelerator-full
point when the accelerator pedal is fully pressed during the test driving
3.12
starting position for test driving
target position on the reference track (3.1) to begin test driving, which is set for each test

Key
1 vehicle under test (VUT)
2 lateral deviation amount of test vehicle
3 virtual collision location
4 equivalent vehicle target (EVT)
5 reference track
6 distance from the virtual collision location (d)
7 lateral deviation angle
Figure 1 — Concept diagram for definitions
4 Basic concept of the test
The purpose of this test method is to evaluate performance of the sudden acceleration control function of the
ACPE device which aims at the prevention or mitigation of a collision that may occur as a result of driver’s
error, i.e. depressing the accelerator pedal instead of the brake pedal. Therefore, this document specifies
environmental conditions, vehicle states, test preparation, test methods, and relevant records which are
necessary to objectively measure system performance. To es
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