This document specifies the application interface in the context of electronic fee collection (EFC) systems using the dedicated short-range communication (DSRC). The EFC application interface is the EFC application process interface to the DSRC application layer. This document comprises specifications of: — EFC attributes (i.e. EFC application information) that can also be used for other applications and/or interfaces,— the addressing procedures of EFC attributes and (hardware) components (e.g. ICC and MMI),— EFC application functions, i.e. further qualification of actions by definitions of the concerned services, assignment of associated ActionType values and content and meaning of action parameters,— the EFC transaction model, which defines the common elements and steps of any EFC transaction,— the behaviour