Overview
ISO 22735:2021 - Road vehicles - Test method to evaluate the performance of lane-keeping assistance systems provides standardized test methods and performance metrics to assess the behaviour of vehicles equipped with lane keeping assistance systems (LKAS). The standard defines the variables, measurement methods, test conditions and procedures used to quantify LKAS performance for M1 category passenger vehicles. Systems that require driver intervention are excluded.
Key topics and requirements
The standard focuses on vehicle dynamics and controllability measurements relevant to LKAS evaluation. Major technical topics include:
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Measured variables and coordinate systems
- Vehicle position (X, Y), longitudinal/lateral speed (Vlong, Vlat), yaw rate (Ψ̇), steering torque and wheel/steering velocities.
- Lateral deviation from path (Y error) referenced to road- and vehicle-fixed coordinate systems.
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Performance metrics
- Time and distance to line crossing (TLC, DTLC)
- LKAS and lane departure warning (LDW) activation times
- Last values before line crossing (e.g., last lateral speed, last yaw rate)
- Maximum yaw velocity, maximum lateral acceleration, maximum steering torque during test runs
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Test equipment and measurement
- Requirements for transducer installation, calibration and data processing.
- Guidance on measurement accuracy to ensure repeatable vehicle dynamics data.
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Test conditions and procedures
- Track and lane marking specifications, environmental conditions, tyre and wheel alignment requirements.
- Vehicle preparation, pre-test conditioning (tyres, brakes), LKAS settings and defined test scenarios.
- Execution steps for reproducible LKAS performance evaluation and reporting (annexed test report template).
Applications and who uses it
ISO 22735:2021 is relevant for professionals and organizations involved in ADAS development, vehicle safety testing and regulatory assessment:
- Vehicle manufacturers and ADAS suppliers - validate and benchmark LKAS behaviour, compare lane-centring vs. lane-departure-prevention strategies.
- Independent test laboratories - perform repeatable, standardized tests for performance verification and certification support.
- Regulators and type-approval authorities - use consistent metrics to assess compliance and inform policy for active driver assistance features.
- Research organizations and OEM safety teams - analyze system limits, edge-case behaviours and human–machine interaction relating to lane keeping.
Related standards
ISO 22735:2021 helps ensure consistent, repeatable evaluation of LKAS performance using clear vehicle-dynamics metrics and prescribed test methods - essential for ADAS validation, safety assessment and product development.