ISO 17573-3:2024

Overview

ISO 17573-3:2024 - Electronic fee collection - System architecture for vehicle-related tolling - Part 3: Data dictionary specifies the syntax and semantics of data objects used in electronic fee collection (EFC) and vehicle-related tolling systems. The standard defines ASN.1-based data types and assigns clear semantics for those types using the Abstract Syntax Notation One (ASN.1) technique (as referenced in ISO/IEC 8824-1). ISO 17573-3:2024 is focused on data modelling for EFC and does not aim to define data types primarily belonging to adjacent fields (for example C-ITS or the financial sector).

Key technical topics and requirements

• ASN.1 data types and semantics: Formal definitions of common and reusable data objects for EFC using ASN.1 notation, enabling unambiguous encoding and decoding.
• Comprehensive data dictionary: A structured catalogue of EFC data elements, including account identifiers, vehicle attributes, geographic coordinates, timestamps and status codes.
• Common and single-level types: Definitions range from simple subtypes (e.g., AccountStatus, CountryCode, VehicleClass, Axles, EnginePower) to complex composite types (e.g., AbsolutePosition2d/3d, EngineDetails, ExhaustEmissionValues).
• Interoperability focus: Consistent naming, types and semantics to support cross-vendor and cross-border tolling solutions.
• Scope constraints: Explicit exclusion of ASN.1 types that primarily belong to other sectors (C-ITS, banking/financial messaging), ensuring the dictionary stays focused on EFC needs.

Practical applications

• Enable interoperable message exchanges between on-board units (OBUs), roadside equipment and back-office systems by using a common ASN.1 data model.
• Guide developers in implementing encoding/decoding libraries, APIs and data validation logic for toll transactions, receipts and vehicle profiling.
• Support system integrators and equipment manufacturers in mapping device data to standardized types for certification and testing.
• Provide a foundation for conformance testing, system documentation, and shared semantics across national or regional tolling networks.

Who should use this standard

• Toll operators and EFC service providers
• System integrators and solution architects implementing tolling systems
• OBU, roadside unit and back-office equipment manufacturers
• Software developers writing encoders/decoders and APIs for toll data exchange
• Certification bodies, regulators and standards working groups

Related standards

• ISO/IEC 8824-1 (ASN.1 specification) - normative reference for syntax
• Other parts of ISO 17573 (system architecture and interfaces) - for broader architectural context

Keywords: ISO 17573-3:2024, electronic fee collection, EFC, data dictionary, ASN.1, vehicle-related tolling, system architecture, interoperability.