ISO 4273:2024 PDF

Overview

ISO 4273:2024 sets forth the requirements and standardized test procedures for automated braking during low-speed manoeuvring (ABLS) in light vehicles. As part of ISO’s Intelligent Transport Systems (ITS) family, this standard addresses the growing need for effective collision avoidance or mitigation technologies in parking and slow maneuvering scenarios-particularly where risks to vulnerable road users and damage to property are significant.

ABLS functions are designed to operate at velocities below 2.8 m/s (10 km/h), focusing on scenarios such as reversing or parking where collisions with pedestrians, other vehicles, and stationary infrastructure (like walls, posts, or pillars) are most prevalent. The standard only applies to light vehicles without trailers and supports ABLS systems operating under SAE Level 0–2, requiring driver supervision or control.

Key Topics

• Scope of ABLS Application

  • Targets low-speed manoeuvring, primarily in parking or reverse scenarios
  • Addresses collision avoidance with pedestrians, cyclists, vehicles, and static obstacles

• ABLS System Requirements

  • Detects the position and movement of objects and the subject vehicle
  • Evaluates collision risk in real time
  • Automatically activates braking if an imminent collision risk is identified

• System Classification

  • Type A: Manual driving (SAE Level 0)
  • Type B: Assisted parking (SAE Level 1)
  • Type C: Partially automated parking (SAE Level 2)

• Performance Classes

  • Base Class: Minimum functionality, focuses on stationary obstacles and/or stationary pedestrians
  • Enhanced Class: Broader detection, includes moving objects and a wider range of manoeuvring directions

• Testing Procedures

  • Specifies minimum requirements for environmental conditions and test object types (referencing the ISO 19206 series)
  • Defines pass/fail criteria and test repetitions for various scenarios, ensuring reproducibility and reliability in ABLS performance

Applications

Automotive Industry

• Vehicle Manufacturers

  • Integrate ABLS systems in new vehicle models to improve safety compliance and support advanced driver assistance systems.
  • Use standardized test procedures to validate ABLS system functionality and meet regulatory/market requirements.

• Component Suppliers

  • Design and supply sensors, controllers, and software that align with ISO 4273:2024 requirements.
  • Reference the standard during product development and certification processes.

• Testing & Certification Bodies

  • Employ ISO 4273:2024 as the benchmark to conduct conformity assessments for ABLS-equipped vehicles.
  • Select appropriate test objects and procedures as outlined in referenced standards, such as the ISO 19206 series.

Road Safety and Urban Mobility

• Urban Planning and Policy

  • Encourage adoption of ABLS in public and private transportation to reduce the frequency and severity of low-speed collisions.
  • Define safety guidelines for parking facilities, garages, and dense urban environments.

• Consumer Awareness

  • Automotive dealers and organizations can communicate ABLS capabilities and limitations to users, supporting safe vehicle operation.

Related Standards

• ISO 17386: Manoeuvring aids for low-speed operation-Performance requirements and test procedures
• ISO 19206 Series: Test devices for target vehicles, vulnerable road users, and objects-essential for realistic and reliable ABLS testing
• ISO 20900: Partially automated parking systems (PAPS)-Performance requirements and test procedures

Practical Value

Adopting ISO 4273:2024 ensures a consistent, safety-focused approach to automated braking at low speeds. This supports the development, validation, and deployment of intelligent transport systems that can significantly reduce parking-related accidents, property damage, and injuries to pedestrians and cyclists. The standard also helps automotive stakeholders streamline product development and regulatory compliance through well-defined requirements and robust, repeatable test procedures.