http://wiki.opentrafficmap.org/ 2026-08-08T09:25:32+00:00 http://wiki.opentrafficmap.org/ http://wiki.opentrafficmap.org/_media/wiki:dokuwiki.svg text/html 2026-08-06T15:54:38+00:00 Anonymous (anonymous@undisclosed.example.com) http://wiki.opentrafficmap.org/en:c-its:messages:cam?rev=1786031678&do=diff CAM (Cooperative Awareness Message) Compatible vehicles broadcast CAM messages at 1 - 10 Hz (typically 4 times per second). A CAM message contains: * GPS position * Speed * Heading * Longitudinal and lateral acceleration * Vehicle length and width text/html 2026-08-06T16:22:07+00:00 Anonymous (anonymous@undisclosed.example.com) http://wiki.opentrafficmap.org/en:c-its:messages:denm?rev=1786033327&do=diff DENM (Decentralized Environmental Notification Message) DENMs are event-driven warning messages (ETSI EN 302 637-3). While CAMs are broadcast continuously, a DENM is only transmitted when something exceptional happens, and it is repeated for as long as the event is valid. text/html 2026-08-06T16:22:16+00:00 Anonymous (anonymous@undisclosed.example.com) http://wiki.opentrafficmap.org/en:c-its:messages:ivim?rev=1786033336&do=diff IVIM (Infrastructure to Vehicle Information Message) IVIMs carry road sign and infrastructure information (ETSI TS 103 301 / ISO 19321) — essentially electronic road signage. Typical contents: * variable speed limits from overhead gantries * text/html 2026-08-06T16:22:10+00:00 Anonymous (anonymous@undisclosed.example.com) http://wiki.opentrafficmap.org/en:c-its:messages:mapem?rev=1786033330&do=diff MAPEM (MAP Extended Message) MAPEMs describe the topology of an intersection (ETSI TS 103 301): the geometry of its lanes, which ingress and egress lanes exist, and which maneuvers connect them. A MAPEM contains, among other things: * the reference position of the intersection text/html 2026-08-06T16:22:13+00:00 Anonymous (anonymous@undisclosed.example.com) http://wiki.opentrafficmap.org/en:c-its:messages:spatem?rev=1786033333&do=diff SPATEM (Signal Phase and Timing Extended Message) SPATEMs transmit the current state of a traffic light (ETSI TS 103 301): which signal groups are red, amber, or green right now — and how the state is expected to change. A SPATEM contains, among other things: