Overview
ISO/TR 5255-2:2023 - Intelligent transport systems - Low-speed automated driving system (LSADS) service - Part 2: Gap analysis - is a technical report that analyzes the safety environment for low-speed automated driving services. It provides a safety-role supplement to the functional model described in ISO/TS 5255-1 and identifies supplemental safety points and roles for LSADS service applications. The report is applicable only to services using LSADS‑equipped vehicles; in‑vehicle control systems are explicitly out of scope. As a gap analysis, it helps stakeholders prepare safety requirement use cases beyond the baseline in ISO/TS 5255-1.
Key topics
- Safety support functions for LSADS: framework for maintaining safe LSADS operations across fleet and infrastructure.
- AI in safety operations: roles of vehicle internal AI and back‑office AI, including AI education, sharing of learned models, and the need for supplemental support when AI encounters novel situations.
- Cybersecurity protection: importance of security credential management and ITS station security services to ensure authenticity and integrity of exchanged data.
- Fail‑safe concepts: design expectations for safe restart, minimum manoeuvring speed and system-wide safety data usage.
- Safety design standards and conformance: references to established safety frameworks and the primacy of “safety first”.
- Human supervisory role: “human‑on‑top” hierarchy for decision support when automated systems require human intervention.
- Connected‑vehicle environment: communication constraints (latency) and resource management (network slicing) affecting safety-critical data exchange and back‑office decision making.
- Use‑case driven gap analysis: illustrative scenarios where in‑vehicle AI needs supplemental infrastructure or human support.
Applications and who uses it
ISO/TR 5255-2 is practical for:
- Transport authorities and city planners assessing infrastructure needs for LSADS deployments.
- OEMs and system integrators designing LSADS services and fleet control centers that integrate vehicle and back‑office AI.
- Safety and systems engineers developing service-level safety requirements and operational design domains (ODD) for SAE Levels 4–5 LSADS.
- ITS platform and network providers evaluating latency, network slicing and secure communications for safety applications.
- Regulators, procurement teams and policy makers aligning requirements and oversight for safe LSADS service rollouts.
Related standards
Relevant references cited in the report include:
This document is valuable for anyone designing, operating or regulating low-speed automated driving services who needs a safety-focused gap analysis that integrates AI, cybersecurity and connected‑vehicle considerations.