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en_alt:c-its

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en_alt:c-its [2026/09/03 09:42] – [Message types] idahoenigmannen_alt:c-its [2026/09/08 08:34] (current) – [Further reading] idahoenigmann
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   * Marshalling Infrastructure Message (MIM),   * Marshalling Infrastructure Message (MIM),
   * Marshalling Vehicle Message (MVM)   * 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 ==== ==== CAM ====
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   - Vehicle length and width   - Vehicle length and width
   - Status of the lights, e.g. indicators, low beam, rear fog light   - Status of the lights, e.g. indicators, low beam, rear fog light
 +
 +The specification for message content is given by ETSI EN 302 637-2 and ETSI TS 103 900.
  
 Since 2019 more and more cars have been equipped with C-ITS and transmit this data, as long as Car2X is enabled in the vehicle's menu. This is the data we use to draw vehicles on the map: Since 2019 more and more cars have been equipped with C-ITS and transmit this data, as long as Car2X is enabled in the vehicle's menu. This is the data we use to draw vehicles on the map:
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 ==== DENM ==== ==== 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: Typical triggers:
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   * [[https://www.its-viennaregion.at/|ITS Vienna Region]] — the ITS competence centre for Vienna, Lower Austria and Burgenland   * [[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.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
en_alt/c-its.1788421370.txt.gz · Last modified: by idahoenigmann