This document specifies location referencing rules to address the specific requirements of Traffic
Message Channel (TMC) systems, which use abbreviated coding formats to provide traffic and travel
information (TTI) messages over mobile bearers (e.g. GMS, DAB) or via exchange protocols like DATEX
II. In particular, the rules address the Radio Data System-Traffic Message Channel (RDS-TMC), a means
of providing digitally-coded TTI to travellers using a silent data channel on FM radio stations, based on
the ALERT-C protocol.