ISO 14907-2:2021

Overview

ISO 14907-2:2021 - "Electronic fee collection - Test procedures for user and fixed equipment - Part 2: Conformance test for the on-board unit application interface" defines conformance test procedures to verify that on-board units (OBUs) for electronic fee collection (EFC) implement required functions and data structures. The tests are based on the Implementation Conformance Statement (ICS) derived from ISO 14906 and focus on application-layer DSRC (Dedicated Short-Range Communication) interoperability and behaviour rather than performance, robustness or reliability.

Key technical topics and requirements

• Scope of conformance testing
  • Verification of DSRC L7 (application layer) functionality.
  • Assessment of EFC application functions and EFC attributes (application information).
  • Tests for addressing procedures of attributes and hardware components.
  • Validation of the EFC transaction model and common transaction steps.
  • Behavioural tests to ensure interoperability at the EFC–DSRC interface.
• Test architecture and artefacts
  • Use of an Implementation Conformance Statement (ICS) proforma (Annex A) and Implementation Extra Information for Testing (IXIT) (Annex B).
  • Requirements for the conformance test system, tester functionality and test documentation (test methods, test cases, test results).
  • Supplier obligations (e.g., submit personalized OBUs and documentation; the standard notes at least five samples may be required).
• Test cases and guidance
  • Informative example test cases for DSRC and EFC are provided (Annex C). These are illustrative - not a mandatory, exhaustive suite.
  • Guidance for composing a complete test suite: small range (exhaustive critical features), large range (boundary/random values), and composite types (sequences/parallel).
• What is excluded
  • ISO 14907-2 does not define tests for performance, robustness, or reliability (see ISO 14907-1 for these).

Practical applications

• Type approval and conformance evaluation of OBUs for tolling and fee collection systems.
• Interoperability testing between OBUs and roadside equipment (RSE) implementing DSRC application interfaces.
• Certification and test-lab workflows: ICS/IXIT completion, test plan composition, and submission of test samples.
• System integration and procurement: specifying conformance criteria in vendor contracts and procurement documents.

Who should use this standard

• OBU manufacturers and suppliers
• Test laboratories and certification bodies
• Road authorities, toll operators and system integrators
• Regulators and standards architects implementing EFC interoperability regimes

Related standards

• ISO 14906 - EFC application interface definition (normative reference)
• EN 12834 - DSRC application layer (normative reference)
• ISO 14907-1 - test procedures for performance/robustness/reliability
• ISO/IEC 10373 series - test methods for smart cards (relevant if OBUs support cards)

Keywords: ISO 14907-2:2021, electronic fee collection, OBU conformance test, DSRC L7, EFC transaction model, ICS, IXIT, interoperability, tolling standards.