Overview
ISO 23792-1:2026 defines the essential framework and general requirements for Motorway Chauffeur Systems (MCS) within intelligent transport systems. Motorway chauffeur systems enable Level 3 automated driving, allowing vehicles to perform the full dynamic driving task (DDT) in their current lane on limited access motorways, provided a fallback-ready user (FRU) is present to take over when required. This international standard establishes a foundation for the safe design, deployment, and verification of MCS in light vehicles.
ISO 23792-1:2026 outlines core functionalities, system states, and transition conditions for MCS, focusing on in-lane automated operation, monitoring, and transition back to the human driver (FRU) as needed. It specifies the performance and test procedures necessary to ensure reliability and safety, supporting broader adoption of automated vehicle technologies and enhancing highway mobility.
Key Topics
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Operational Design Domain (ODD):
Every MCS must have a clearly defined ODD, setting the boundaries for safe system operation. ODD descriptions include roadway characteristics, expected environmental conditions, and traffic scenarios, all of which must be communicated to users.
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System Functionalities:
Fundamental requirements for MCS include:
- Performing the entire DDT within the current lane of travel
- Monitoring the vehicle, surroundings, system health, and FRU status
- Issuing a Request to Intervene (RTI) when conditions exceed system capability
- Continuing operation temporarily after RTI to allow safe human takeover
- Bringing the vehicle to a stop if the FRU does not respond
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System Classification:
- Type 1 MCS: Engages independently based on a driver's explicit command.
- Type 2 MCS: Automatically transitions from other driving automation systems; integration with multi-feature systems is addressed in this edition.
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User Information and Safety:
The standard emphasizes the necessity of clear instructions for users, detailing the MCS’s capabilities, limitations, and the roles and responsibilities of the FRU.
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System Limitations and Misuse Prevention:
Providers must document potential performance-impairing and incapacitating conditions and develop countermeasures against misuse. User materials must reflect these to promote safe usage.
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Testing and Verification:
The document details standardized test procedures to validate MCS compliance, covering scenarios from unresponsive users to obstacle avoidance and system disengagement.
Applications
ISO 23792-1:2026 is directly applicable to:
- Automotive manufacturers integrating Level 3 automated driving features in light vehicles used on motorways
- System developers creating or implementing MCS for controlled highway environments
- Test labs and certification bodies designing tests for safety and performance verification of automated driving systems
- Policy makers and regulators setting foundational requirements for advanced driver-assistance systems
The standard streamlines the development and evaluation process for Level 3 automated highway driving systems, helping stakeholders address critical aspects such as user awareness, operational safety, and system interoperability.
Related Standards
- ISO 15622: Intelligent transport systems - Adaptive cruise control systems - Performance requirements and test procedures
- ISO 21448: Road vehicles - Safety of the intended functionality
- ISO/SAE PAS 22736: Taxonomy and definitions for terms related to driving automation systems for on-road motor vehicles
- ISO 23792-2: Further requirements for discretionary lane changes (in preparation)
- ISO 23792-3: Requirements for mandatory lane changing operations (in preparation)
ISO 23792-1:2026 forms part of a comprehensive suite of standards supporting the safe deployment of intelligent transport and automated driving systems on motorways worldwide. By ensuring consistent interpretation and implementation, this standard facilitates harmonization across manufacturers and regions, fostering progress in mobility innovation.
Open preview (PDF)Intelligent transport systems — Motorway chauffeur systems (MCS) — Part 1: Framework and general requirements
