Differences

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--- en_alt:c-its [2026/09/03 09:46] – [CAM] idahoenigmann
+++ en_alt:c-its [2026/09/08 08:34] (current) – [Further reading] idahoenigmann
@@ Line 56: / Line 56: @@
   * Marshalling Infrastructure Message (MIM),
   * Marshalling Vehicle Message (MVM)
+While ETSI defines the structure of C-ITS messages and their permitted value ranges, some values remain open to interpretation—for example, a role may be represented as an integer without specifying what a value such as 42 actually means. ETSI can also be vague about when and how often messages should be transmitted, sometimes specifying only a broad range such as 1–100 Hz.
+C-Roads (https://www.c-roads.eu/), an EU-funded platform for harmonising C-ITS, addresses these ambiguities. It defines concrete use cases, specifying which messages should be sent, how information should be modelled within those messages, which values to use, and under what conditions and frequency messages should be transmitted.
 ==== CAM ====
@@ Line 76: / Line 80: @@
 ==== DENM ====
-DENMs are **event-driven** warning messages (ETSI EN 302 637-3). While CAMs are broadcast continuously, a DENM is only sent when something exceptional happens, and it is repeated for as long as the event is valid.
+DENMs are **event-driven** warning messages (ETSI EN 302 637-3 and ETSI TS 103 831). While CAMs are broadcast continuously, a DENM is only sent when something exceptional happens, and it is repeated for as long as the event is valid.
 Typical triggers:
@@ Line 128: / Line 132: @@
   * [[https://www.its-viennaregion.at/|ITS Vienna Region]] — the ITS competence centre for Vienna, Lower Austria and Burgenland
   * [[https://www.youtube.com/watch?v=G2VGzrJVO2Q|Video: How to Improve Public Transport with C-ITS — Vienna]] (05/2026)
+  * [[https://www.c-roads.eu/|C-Roads: The European C-ITS Platform]] - EU-funded harmonization of C-ITS