ISO 15784-2:2024

Overview - ISO 15784-2:2024 (SNMP for ITS roadside communications)

ISO 15784-2:2024 defines a standardized method for centre-to-field device communications in Intelligent Transport Systems (ITS) using Simple Network Management Protocol (SNMP). The standard targets data exchange between traffic management centres and roadside equipment, and between roadside devices themselves, for traffic management functions. It mandates SNMPv3 for security and updates the security stack to support Transport Layer Security (TLS) 1.3 for secure transports.

The document is not applicable to in-vehicle, in-cabinet, camera motion video, or centre-to-in-vehicle communications. It is suitable when exchanged data can be modelled as retrievable/storable elements (MIB objects) and where deterministic sub-second real-time performance is not required.

Key technical topics and requirements

• SNMPv3 requirement: Uses SNMP version 3 for authenticated and encrypted management operations.
• Management Information Base (MIB): Data is defined in MIBs (including ISO/TS 26048 series and project/vendor MIBs) to represent configuration, control and monitoring parameters for roadside equipment.
• Security models: Supports user-based security and transport-level security; encourages best practices for authentication, authorization and confidentiality.
• Transport mappings: Defines mappings over UDP/TCP with IPv4/IPv6 and secure transport options (TLS).
• Access control: View-based access control and notification management for exception reporting.
• Performance expectations: Typical SNMP operations take <100 ms, but network variability can incur multi-second delays; not intended for applications requiring guaranteed sub-second latency.
• Support features: Dynamic object features (per ISO/TS 26048-1) to reduce SNMP overhead on low-bandwidth links; SNMP notifications for exception reports.

Practical applications

• Remote monitoring and configuration of roadside ITS equipment (traffic signals, dynamic message signs, environmental sensors).
• Periodic status polling, bulk retrieval/storage of device parameters, and exception/event reporting from field devices to centres.
• Use on heterogeneous networks where open, interoperable device management reduces vendor lock-in and deployment cost.
• Suitable for intermittent or frequent non-deterministic exchanges and for low-bandwidth links when using dynamic object optimizations.

Who should use this standard

• Traffic management agencies and municipal ITS operators
• System integrators and solution vendors building roadside device management systems
• Network architects and cybersecurity teams defining ITS device communication and access control
• Procurement officers specifying open, interoperable ITS field-management interfaces

Related standards and resources

• ISO 15784 series (other parts) and ISO/TS 26048-1 for dynamic object and notification management features
• SNMP standards (IETF) and secure transport guidelines (TLS 1.3)
• Electronic profile and MIB artefacts available from the ISO standards portal for implementation guidance

Adopting ISO 15784-2:2024 helps achieve interoperable, secure, and maintainable ITS field device management using widely adopted SNMP practices.