The scope for this European Standard is limited to: - payment method: Central account based on EFC-DSRC; - physical systems: OBU, RSE and the DSRC interface between them (all functions and information flows related to these parts); - DSRC-link requirements; - EFC transactions over the DSRC interface; - data elements to be used by OBU and RSE used in EFC-DSRC transactions; - security mechanisms for OBU and RSE used in EFC-DSRC transactions.