HMI Handover Procedure SOP (AS/NZS 4024.1-2018 Aligned)

The HMI Handover Procedure SOP is a cornerstone of safe human-autonomy collaboration in mining and heavy industrial environments deploying Autonomous Haulage Systems (AHS). Rooted in the risk-based design philosophy of AS/NZS 4024.1-2018, it treats handover not as a simple UI toggle but as a formal safety function requiring rigorous validation of preconditions — including vehicle kinematic state (e.g., speed ≤ 0 km/h, brake applied), environmental readiness (e.g., GPS integrity, obstacle clearance), and operator situational awareness (e.g., confirmed visual verification, HMI focus confirmation via biometric or interaction telemetry). Each handover event is time-stamped, logged with contextual diagnostics, and subject to dual-channel verification: one from the AHS control layer (e.g., autonomy stack status) and another from the safety-critical monitoring layer (e.g., SIL2-certified watchdog subsystem). The SOP further prescribes graded handover modes — 'supervised', 'semi-autonomous', and 'full manual' — each with distinct authority boundaries, feedback modalities (e.g., haptic alerts, colour-coded status bars), and mandatory timeout/reversion protocols to prevent operator complacency or automation surprises. Compliance is verified through periodic third-party audits, functional safety assessments (per AS/NZS 61508), and integration testing against ISO 13849-1 PL requirements.