Functional Safety Assessment of an Automated Lane Centering System
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Summary
This report assesses the functional safety of a generic Automated Lane Centering (ALC) system, a technology providing continuous lateral control to keep vehicles within travel lanes. Conducted by the Volpe National Transportation Systems Center for the National Highway Traffic Safety Administration (NHTSA), the study aims to expand the knowledge base for automotive electronics reliability and inform future regulatory decisions. The research specifically addresses the safety of ALC systems and their reliance on foundational steering and braking systems, many of which are legacy components predating modern safety standards. The study follows the Concept Phase of the ISO 26262 functional safety standard to identify integrity requirements independent of specific implementation variations. The methodology integrates multiple hazard analysis techniques, including Hazard and Operability Study (HAZOP), Functional Failure Modes and Effects Analysis (FMEA), and Systems-Theoretic Process Analysis (STPA). The researchers defined the scope of a generic ALC system, detailing its interaction with lane detection sensors, driver-vehicle interfaces, and foundational control systems. They performed a vehicle-level hazard analysis to identify potential malfunctions and unsafe control actions. Risk assessment was conducted using the Automotive Safety Integrity Level (ASIL) framework, evaluating hazards across five levels of automation (Levels 0–5). The analysis specifically differentiated between Level 2 systems designed to keep drivers engaged and those susceptible to foreseeable driver disengagement. The study identified five vehicle-level hazards and assigned ASIL ratings based on severity, exposure, and controllability. For Level 1 systems and engaged Level 2 systems, hazards ranged from ASIL B to ASIL D. However, for Level 2 systems allowing driver disengagement, as well as Levels 3, 4, and 5, all identified hazards were assigned ASIL D, the highest integrity level. Based on these findings, the researchers derived 47 functional safety requirements and 26 additional safety requirements for the ALC system and its components, including the control module, sensors, and communication systems. The report also identified 162 relevant generic diagnostic trouble codes and developed seven example test scenarios to validate safety goals. The significance of this work lies in demonstrating how the ISO 26262 Concept Phase can be implemented for automated driving systems, particularly by integrating multiple analysis methods and addressing varying levels of automation. The findings provide a baseline functional safety concept for ALC development and highlight the critical safety implications of driver disengagement in lower-level automation systems. By establishing these requirements and test scenarios, the report supports NHTSA’s mission to ensure the safe operation of emerging electronic control systems and provides foundational data for potential future policy and regulatory activities regarding automated vehicle technologies.
Key finding
The safety analysis derived 47 functional safety requirements and 26 additional safety requirements for the automated lane centering system.
Methodology
theoretical
Provenance
The full processing record for this entry. Every stage of this paper's journey through the pipeline is logged — what ran, with which tool and model, how many attempts it took, and when it last completed. Discovered via bulk_ingest_rosap on 2026-05-23 (6 acquisition events logged).
| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | rosap | — | — | 2 | 2026-05-23 |
| archive | success | — | — | — | 1 | 2026-05-23 |
| extract | success | cached | — | — | 2 | 2026-06-10 |
| clean | success | — | — | — | 1 | 2026-06-01 |
| chunk | success | — | — | — | 1 | 2026-06-01 |
| embed | success | — | — | — | 1 | 2026-06-02 |
| enrich | success | — | — | — | 1 | 2026-05-23 |
| promote | success | — | — | — | 1 | 2026-05-23 |
| summarize | success | llm | qwen3.6-27b-prismaquant | summ-v5 | 3 | 2026-06-10 |
| tag | success | vector_similarity | — | — | 19 | 2026-06-11 |
| verify | success | — | — | — | 2 | 2026-06-10 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.
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- Theoretical Contribution: conceptual framework