Overview
ISO 22733-2:2023 - "Road vehicles - Test method to evaluate the performance of autonomous emergency braking systems - Part 2: Car to pedestrian" defines standardized test methods for assessing autonomous emergency braking (AEBS) performance in car-to-pedestrian collision scenarios. The standard focuses on situations where a Vehicle Under Test (VUT) travels in a straight line and a pedestrian either walks longitudinally on the same road or approaches the road perpendicularly. Systems that require driver intervention are out of scope. Forward Collision Warning Systems (FCWS) are treated as part of AEBS when they provide warning prior to autonomous braking.
Key Topics and Requirements
- Test scenarios: Defined pedestrian approach geometries (longitudinal and perpendicular) to replicate realistic car-to-pedestrian encounters; note that only a subset of scenarios may be used depending on accidentology.
- Measured variables: Includes VUT speed and impact speed, AEBS/FCW activation times, mean longitudinal acceleration, maximum yaw rate, lateral path error, and steering wheel velocity.
- Test conditions: Requirements for test track, weather, surroundings, and general data; vehicle-specific conditions such as AEBS settings, deployable pedestrian protection systems, tyres, braking system, other influencing systems, and loading conditions.
- Measuring equipment and calibration: Specification for instrument description, transducer installation, calibration and data processing to ensure repeatable, traceable test results.
- Test procedures and conduct: Preparation steps (brake and tyre conditioning), test execution, validity criteria, and end-of-test conditions.
- Performance metrics: Metrics for tests leading to collision avoidance, designated maximum speeds without collision, and cases where collision occurs - enabling objective evaluation across different situations.
Applications and Who Uses It
ISO 22733-2:2023 is essential for:
- Vehicle manufacturers validating AEBS and pedestrian protection features during development.
- ADAS suppliers and system integrators measuring sensor/algorithm performance and tuning AEBS/FCW behavior.
- Independent test laboratories and certification bodies conducting repeatable, standards-compliant safety assessments.
- Regulatory agencies and policymakers referencing harmonized test methods for safety regulations and compliance.
- Safety engineers and vehicle dynamics teams analyzing interaction between automated braking performance and vehicle dynamic behavior.
Practical use cases include pre‑production validation, homologation testing, comparative benchmarking of AEBS performance, and post‑incident forensic analysis.
Related Standards
- ISO 22733-1:2022 - Part 1: Car-to-car (complementary test methods for vehicle-to-vehicle scenarios)
- ISO 8855 - Vehicle dynamics vocabulary
- ISO 15037-1:2019 - Vehicle dynamics test methods - General conditions for passenger cars
ISO 22733-2:2023 provides a structured, repeatable framework for evaluating car-to-pedestrian AEBS performance, helping stakeholders improve pedestrian safety through consistent testing and measurable performance metrics.
Open preview (PDF)Road vehicles — Test method to evaluate the performance of autonomous emergency braking systems — Part 2: Car to pedestrian
