ISO 22733-1-2022 PDF

Full title and description

Road vehicles — Test method to evaluate the performance of autonomous emergency braking systems — Part 1: Car-to-car. This ISO standard specifies laboratory and track test methods used to evaluate how an autonomous emergency braking system (AEBS) performs when a vehicle under test (VUT) approaches another vehicle in the same lane (longitudinal, straight-line scenarios) with the objective of avoiding or mitigating collisions.

Abstract

The document defines test scenarios, target/vehicle alignment and instrumentation, and measurable criteria for assessing whether an AEBS avoids or mitigates collisions in car‑to‑car situations. Systems that require driver intervention are excluded; the focus is on longitudinal collision scenarios and repeatable methods to characterise system behaviour and performance.

General information

• Status: Published.
• Publication date: September 2022 (Edition 2 published 2022‑09).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 43.040.40 (Braking systems).
• Edition / version: Edition 2 (ISO 22733‑1:2022, replaces the 2021 edition).
• Number of pages: 18 pages (official ISO publication length).

Scope

Specifies reproducible test methods to evaluate performance of onboard AEBS in car‑to‑car collisions that occur in straight‑line, longitudinal approaches where both vehicles are aligned along the longitudinal axis. The standard addresses detection, emergency braking intervention and objective outcome measures (collision avoidance or mitigation) and excludes systems that require explicit driver intervention. It is limited to longitudinal (front‑to‑rear) scenarios and does not cover lateral or complex manoeuvre cases.

Key topics and requirements

• Definition of vehicle under test (VUT) and target vehicle setups for repeatable car‑to‑car scenarios.
• Scenario descriptions and alignment (longitudinal axis alignment, relative speeds and closing conditions) used to provoke AEBS intervention.
• Instrumentation and data recording requirements to measure speed, distance, deceleration and impact/near‑miss outcomes.
• Performance criteria for collision avoidance and mitigation (objective metrics to compare AEBS effectiveness across tests).
• Restrictions and exclusions (systems requiring driver action; non‑longitudinal cases).

Typical use and users

Used by vehicle manufacturers and OEM suppliers to validate and tune AEBS; independent test laboratories and NCAP organisations to evaluate system performance; regulators and type‑approval authorities as a basis for test protocols; and safety researchers analysing real‑world implications of AEBS behaviour. Engineers performing system integration, hardware‑in‑the‑loop (HIL) and track testing will use this standard as a reference for reproducible car‑to‑car assessments.

Related standards

Part of the ISO 22733 series. Notable related documents include: ISO 22733‑2:2023 — Road vehicles — Test method to evaluate the performance of autonomous emergency braking systems — Part 2: Car to pedestrian (addresses pedestrian scenarios). The ISO 22733 family is used alongside regional and international regulatory instruments for AEBS (for example UN regulations addressing AEBS performance for light and heavy vehicles).

Keywords

AEBS, autonomous emergency braking, automatic emergency braking, test method, car‑to‑car, vehicle safety, VUT, longitudinal scenario, ISO 22733, braking systems.

FAQ

Q: What is this standard?

A: ISO 22733‑1:2022 is an international standard that specifies repeatable test methods to evaluate the performance of autonomous emergency braking systems in car‑to‑car (longitudinal) scenarios.

Q: What does it cover?

A: It covers test set‑ups, scenario definitions, instrumentation and objective performance criteria to determine whether an AEBS avoids or mitigates collisions in straight‑line, longitudinal encounters with another vehicle. Systems that require driver intervention are excluded.

Q: Who typically uses it?

A: Vehicle manufacturers, component suppliers, test labs, NCAP and regulatory authorities use it for development, verification, independent assessment and to inform type‑approval or safety assessment processes.

Q: Is it current or superseded?

A: The 2022 publication is Edition 2 (ISO 22733‑1:2022) and replaces the 2021 version; the standard is published and current as of its September 2022 release. Users should verify national adoptions or later amendments before finalising regulatory or contractual requirements.

Q: Is it part of a series?

A: Yes — it is Part 1 of the ISO 22733 series. Part 2 (ISO 22733‑2:2023) covers car‑to‑pedestrian test methods; the series is maintained by ISO/TC 22/SC 33 (vehicle braking/controls committee).

Q: What are the key keywords?

A: AEBS, automatic emergency braking, car‑to‑car, test method, VUT, longitudinal, braking performance, ISO 22733.