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This part of ISO/TS 14907 describes tests that verify on-board unit (OBU) conformance of implementations of functions and data structures, as defined in the implementation conformance statement based on ISO 14906:2011/Amd1:2015, for electronic fee collection (EFC) applications. After the tests of isolated data items and functions (C.2 to C.4), an example is given for testing of a complete EFC transaction (C.3). The scope of this part of ISO/TS 14907 comprises definitions of OBU conformance assessment tests of — basic dedicated short-range communication (DSRC) L7 functionality, — EFC application functions, — EFC attributes (i.e. EFC application information), — the addressing procedures of EFC attributes and (hardware) components [e.g. integrated circuit cards (ICC) and man-machine interfaces (MMI)], — the EFC transaction model, which defines the common elements and steps of any EFC transaction, and — the behaviour of the interface so as to support interoperability on an EFC-DSRC application interface level, see Figure 1.