Overview
ISO/TS 22741-10:2024 - "Intelligent transport systems - Roadside modules AP‑DATEX data interface - Part 10: Variable message signs" specifies the data structures, messages and application‑level profile required for interoperable management of LED matrix Variable Message Signs (VMSs). The technical specification defines user needs, data elements, messages, communication dialogues and packet structures so traffic management centres and roadside VMS equipment can exchange control, status and display information reliably and consistently.
Key topics and technical requirements
- Interoperability focus: Defines interchange format and representation to avoid bespoke protocols and vendor lock‑in.
- OSI‑based profiling: Uses OSI profile concepts (interchange/representation and application profiles) to specify application, presentation and session layer behaviors for AP‑DATEX messaging.
- Device identification and capabilities: Data elements to identify VMS devices, discover capabilities (pixel layout, colour, supported messages) and operational constraints.
- Control and display management: Requirements for message sign control mode, message library management, and sign display updates (see Clauses 8.1–8.3).
- Monitoring and diagnostics: Standardized status reporting for display doors, mains power, power supplies, light sensors and pixels (Clauses 8.4–8.8).
- Dialogues and packet structures: Defined dialogues for getting/setting elemental data and normative data packet structures (Clause 9, Annex A).
- Conformance and traceability: Conformance rules and a requirements traceability matrix mapping user needs to design elements (Clauses 5 and Annex B).
Practical applications
- Ensures consistent exchange of control messages and diagnostics between traffic management centres (TMCs) and roadside VMS units.
- Enables easier procurement and replacement of VMS hardware by reducing dependence on proprietary protocols.
- Supports system integrators and software developers building centralized or distributed ITS control systems, enabling standardized message libraries and remote diagnostics.
- Improves road safety and traveler information by enabling real‑time, interoperable message distribution upstream of incidents, interchanges and congestion points.
Who should use this standard
- Traffic authorities and road operators specifying VMS procurement or integration.
- VMS manufacturers and hardware suppliers implementing AP‑DATEX interfaces.
- ITS system integrators, software developers and consultants designing traffic management centre solutions.
- Maintenance teams and asset managers needing standardized diagnostics and status reporting.
Related standards
- ISO 22741 series (general guidance on roadside modules and AP‑DATEX interfaces)
- ISO/IEC TR 10000‑2 (OSI profile classification and presentation)
Keywords: ISO/TS 22741-10:2024, intelligent transport systems, VMS, variable message signs, AP‑DATEX, LED matrix, interoperability, traffic management centre, message library, diagnostics.