ISO/TS 16460:2016 specifies the following:
- the Localized Message (LM) format: an NPDU of a networking and transport layer protocol that does not support routing of a packet through a network;
- the Service Advertisement Message (SAM): an APDU to be transported in for example, an LM;
- the Service Response Message (SRM): an APDU acknowledging a SAM that offered a service based on an ITS application class to be transported in for example, an LM;
- the related basic requirements for procedures.
Specifications are partly done by normative references to IEEE 1609.3TM-2016.