Overview - ISO 23375:2023 (CELM)
ISO 23375:2023, titled Intelligent transport systems - Collision evasive lateral manoeuvre systems (CELM) - Requirements and test procedures, defines functional requirements, basic control strategies, driver interface elements and verification tests for systems that avoid forward-path collisions by controlled lateral movement. A CELM generates yaw moment to steer the subject vehicle away from an object when a collision is predicted. Systems can act automatically or support driver-initiated lateral manoeuvres. The standard applies to light vehicles and heavy trucks and explicitly excludes vehicles equipped with trailers. Note that ISO 23375 does not prescribe specific object-detection or perception technologies.
Key topics and technical requirements
ISO 23375:2023 organizes requirements and test methods across system design and verification elements, including:
- System overview and classification - definitions of CELM types, functional elements and system states.
- Functional requirements - minimum behaviours for activation, lateral control and minimization of vehicle lateral movement.
- State transitions and failure response - defined states, transition conditions and required system behaviour on faults or failures.
- Driver interface and status indication - basic user controls, active/failure/warning indications and user-adjustable intervention thresholds.
- Driver override - requirements ensuring the driver can override CELM interventions.
- Operating conditions - object conditions, activation speed ranges, road and lane-marking considerations; separate treatment for Type 1 and Type 2 systems.
- Performance evaluation and test procedures - environmental, test course and vehicle conditions; test target specification, data recording, trajectory/torque data and pass criteria for verification.
- Annexes - informative examples of use cases and additional testing guidance.
Practical applications and users
ISO 23375:2023 is practical for:
- Automotive OEMs and CELM suppliers designing lateral collision-avoidance features to meet consistent functional and safety expectations.
- Test laboratories and validation engineers implementing the standard’s test procedures and pass criteria to verify system performance.
- Regulators and safety assessors seeking harmonized requirements for approval, compliance and procurement.
- Road safety researchers and integrators evaluating CELM interaction with existing ADAS (Advanced Driver Assistance Systems).
Benefits include consistent verification methods, clearer driver interface requirements, and guidance to reduce forward-path collisions through lateral control.
Related standards
Relevant standards referenced by ISO 23375:2023 include:
For full normative detail and official test procedures, consult the ISO 23375:2023 publication via ISO or your national standards body.