ISO 17575-3:2016

Overview

ISO 17575-3:2016 - part of the ISO 17575 series - specifies the context data exchanged between a Front End (on-board equipment, OBE, plus optional proxy) and the Back End in autonomous electronic fee collection (EFC) systems. The standard defines the content, semantics and format of toll context descriptions used to configure charging processes for road section charging, area charging (distance or time) and cordon charging. Context data include the charged network, charging rules, liable vehicle definitions and required charge-report contents.

Key technical topics and requirements

• Context data model: Definition of the properties of a single EFC context, including partitioning support where one scheme is split into multiple context partitions.
• Tariff and determinants: Structured tariff information and required tariff determinants (vehicle parameters, time classes, currencies, rounding rules and optional second currency).
• Context layout: Geographic and network descriptions, including optional use of standardized map files (GDF) to describe toll-liable networks (references ISO 12855).
• Reporting rules: Configuration of charge-report contents and frequency, including support for raw localization, map-matched objects or fully priced transactions.
• Protocol and encoding: Application data unit structures, message authentication and encoding rules (ASN.1 data type specifications provided in Annex A).
• Versioning and validity: Protocol version identification and context data versioning to manage updates and validity periods.
• Conformance & guidance: Protocol implementation conformance statement (PICS) proforma (Annex B), hierarchical data illustrations and informative examples (Annexes C–F).
• EETS alignment: Guidance on applying ISO 17575-3 in a European Electronic Toll Service (EETS) environment with reference to EU Decision 2009/750 (Annex G).

Practical applications and who uses this standard

ISO 17575-3:2016 is intended for stakeholders designing, deploying or operating autonomous toll systems:

• Toll operators and road authorities - to define toll regimes, tariffs, reporting requirements and legal compliance for charging schemes.
• Back‑End system vendors - to format and convey context data to OBEs and implement protocol versioning, authentication and PICS.
• OBE and telematics manufacturers - to interpret context data, implement charging logic and produce compliant charge reports.
• Service providers and integrators - to enable interoperability between Front End and Back End systems, especially in multi‑domain or EETS scenarios.
• Consultants and regulators - to assess conformity, implement partitioned toll contexts and adopt standard map-based descriptions.

Related standards

• ISO 17575-1:2016 (Charging)
• ISO 17575-2:2016 (Communication and connection to lower layers)
• ISO 17573 (System architecture)
• ISO 14906 (OBE/Back End baseline compatibility)
• ISO 12855 (GDF geographic data guidance)
• EU Decision 2009/750 (EETS framework)

ISO 17575-3:2016 provides the structured, interoperable context data foundation needed to implement robust, auditable and geographically-aware autonomous electronic fee collection systems.