ISO/TR 12353-4:2024

ISO/TR 12353-4:2024 - Overview

ISO/TR 12353-4:2024 is a Technical Report from ISO that compiles commonly used methodologies for assessing the effectiveness of vehicle safety systems. It covers active, passive and integrated safety technologies - including crash avoidance systems - and describes both retrospective and prospective assessment approaches. Effectiveness is treated as the capability of a system or feature to avoid or mitigate crashes, injuries or fatalities. For each method the report explains applicability, advantages, limitations, accuracy, sensitivity and the necessary input/output data and formats.

Key topics and technical requirements

The report organizes methodologies and terminology to support consistent traffic accident analysis:

• Foundational terms: exposure, risk, odds, field of effect, effectiveness rate, potential effectiveness, benefit, safety performance.
• Retrospective methods (based on real-world data):
  • Crash rate estimation using crash case and exposure data
  • Dose–response models
  • Induced exposure methods
  • Paired comparisons
• Prospective methods:
  • Virtual simulation frameworks (per ISO/TR 21934-1)
  • Crash momentum index and C–V plane analyses (usable prospectively or retrospectively)
• Method descriptors: For each methodology the report provides:
  • Applicability and typical use cases
  • Advantages and limitations, including sensitivity to data quality
  • Input data requirements (e.g., crash cases, exposure measures, vehicle/feature attributes, simulation parameters)
  • Output formats and metrics (effectiveness rates, benefit estimates, safety performance indicators)
  • Accuracy, validation and sensitivity considerations

Practical applications

ISO/TR 12353-4 supports a wide range of practical activities:

• Evaluating real-world safety benefits of ADAS, airbags, seatbelt systems and integrated vehicle safety features
• Designing prospective safety assessments via validated virtual simulations for new features
• Conducting post‑market surveillance and regulatory impact analyses
• Informing safety ratings, insurance risk models and public policy decisions
• Comparing methodologies to select suitable analysis approaches given available data quality and study objectives

Who should use this standard

• Vehicle manufacturers and system developers assessing product safety performance
• Road safety researchers and traffic accident analysts
• Regulatory bodies and standards developers evaluating safety claims
• Insurance analysts and policymakers performing benefit/cost or risk assessments
• Test laboratories and simulation teams implementing prospective assessments

Related standards

• ISO/TR 21934-1 (referenced for virtual simulation methodology)
• Other parts of the ISO 12353 series (for broader traffic accident analysis context)

Keywords: ISO/TR 12353-4:2024, vehicle safety system effectiveness, traffic accident analysis, crash avoidance systems, retrospective methods, prospective simulations, dose–response model, crash rate estimation.