Overview
ISO 25110:2025 - Electronic fee collection: Interface definition for on‑board account using an integrated circuit card (ICC) - defines the interface and data transfer models for on‑board accounts that use ICCs as the payment medium. The standard focuses on the mid‑layer interface between roadside equipment (RSE) and on‑board equipment (OBE) to access the ICC, and provides functional configurations, RSE command definitions, data formats and element definitions, and transaction examples (Annex B). This is the second edition (2025), updating the 2017 edition and aligning terminology with ISO 17573‑2:2025.
Key topics and requirements
- Data transfer models: Specifies three models to meet operational requirements:
- Transparent type - direct transfer of ICC APDU command/response via the OBE (Bridge‑1).
- Caching type - EFC data read into the OBE’s secure application module (SAM) and served to the RSE (Bridge‑2).
- Buffering type - non‑sensitive EFC data cached in OBE buffer memory for later transfer.
- Interface definitions: Detailed interface behaviours between RSE and OBE for each model, including functional configuration and command/response flows.
- RSE command and APDU formats: Defines RSE commands for ICC access, data element formats and how APDUs are encapsulated and transported.
- Security and functional mapping: Outlines where sensitive operations should be performed (e.g., in ICC or SAM) and delineates responsibilities among RSE, OBE and ICC.
- Practical transaction examples: Annex B provides deployed examples to aid implementation and interoperability testing.
- Normative references: Aligns with ISO/IEC 7816‑4 (ICC organization and commands), ISO 14906 (DSRC application interface), and ISO 17573‑2 (vocabulary).
Applications and who should use it
ISO 25110:2025 is intended for:
- Toll road operators and system integrators implementing on‑board account electronic fee collection (EFC) using ICCs.
- OBE and RSE manufacturers building DSRC-capable units and ICC access bridges.
- Payment system architects and transport authorities planning interoperable on‑board payment solutions (including mobile ICC implementations).
- Test labs and certification bodies verifying compliance and interoperability.
Practical uses include designing OBE architectures (transparent/caching/buffering), defining RSE‑to‑ICC command sets, and selecting an implementation example as a “toolbox” to meet regional operational requirements.
Related standards
- ISO/IEC 7816‑4 - Identification cards: organization, security and commands for interchange
- ISO 14906 - Electronic fee collection: DSRC application interface definition
- ISO 17573‑2:2025 - EFC system architecture vocabulary
Keywords: ISO 25110:2025, electronic fee collection, on‑board account, integrated circuit card (ICC), RSE, OBE, data transfer models, transparent type, caching type, buffering type, APDU, DSRC, SAM.