http://wiki.opentrafficmap.org/ 2026-08-24T00:34:25+00:00 http://wiki.opentrafficmap.org/ http://wiki.opentrafficmap.org/_media/wiki:dokuwiki.svg text/html 2026-08-10T12:50:57+00:00 Anonymous (anonymous@undisclosed.example.com) http://wiki.opentrafficmap.org/en_alt:c-its?rev=1786366257&do=diff What is C-ITS? C-ITS stands for Cooperative Intelligent Transport Systems: vehicles and road infrastructure exchange information directly with each other over radio, without going through any network operator or manufacturer cloud. This page explains the technology itself. Which vehicles and which infrastructure actually transmit is covered on text/html 2026-08-14T22:06:43+00:00 Anonymous (anonymous@undisclosed.example.com) http://wiki.opentrafficmap.org/en_alt:community?rev=1786745203&do=diff Community OpenTrafficMap is an open project run by volunteers. This page covers how to take part, who is behind it, and where to find the code. Contributing Run a receiver The most valuable contribution by a distance. The map can only show live data where a receiver is nearby, so every new location extends what the project can see — and a location nobody covers yet is worth more than a better antenna somewhere already covered. text/html 2026-08-15T14:45:03+00:00 Anonymous (anonymous@undisclosed.example.com) http://wiki.opentrafficmap.org/en_alt:coverage?rev=1786805103&do=diff Coverage Where C-ITS is actually live. This page is purely geographic — which regions have deployed C-ITS, and what people have really received there. Which vehicles and infrastructure transmit in the first place is covered on Senders. How this list works text/html 2026-08-14T22:06:44+00:00 Anonymous (anonymous@undisclosed.example.com) http://wiki.opentrafficmap.org/en_alt:faq?rev=1786745204&do=diff Common questions This page is an index, not an article. Each question links to the place where it is answered in context, together with everything else you need to know about that topic. The receiver * What do the LEDs mean? → LEDs & troubleshooting * Does it matter which USB-C port powers it? text/html 2026-08-10T12:50:59+00:00 Anonymous (anonymous@undisclosed.example.com) http://wiki.opentrafficmap.org/en_alt:placement?rev=1786366259&do=diff Placement & Outdoor C-ITS reaches a few hundred metres in a town and a few kilometres with a clear view. Within those limits, where you put the receiver decides almost everything — far more than which board you built. A well-placed cheap receiver beats a badly-placed good one every time. text/html 2026-08-14T22:06:45+00:00 Anonymous (anonymous@undisclosed.example.com) http://wiki.opentrafficmap.org/en_alt:receivers?rev=1786745205&do=diff Receivers What you need to actually hear C-ITS. There is one purpose-built receiver that most people use, and a growing number of independent projects that solve the same problem with different hardware. All of them end up in the same place: raw 802.11p frames on the text/html 2026-08-15T14:45:04+00:00 Anonymous (anonymous@undisclosed.example.com) http://wiki.opentrafficmap.org/en_alt:senders?rev=1786805104&do=diff Senders Who actually transmits C-ITS. This page is about models and manufacturers; for the geography — which cities and motorways are live — see Coverage. The single most important distinction: only vehicles with ITS-G5 (WLANp / IEEE 802.11p, 5.9 GHz) broadcast CAM and DENM messages over direct radio, and only those can be picked up by a receiver. Several manufacturers market a hazard-warning feature under a similar name, but route it through their own cloud over the cellular network. Those ve… text/html 2026-08-14T22:06:46+00:00 Anonymous (anonymous@undisclosed.example.com) http://wiki.opentrafficmap.org/en_alt:server?rev=1786745206&do=diff The OpenTrafficMap server Every receiver, whatever it is built from, ends up doing the same thing: publishing raw 802.11p frames to one central MQTT broker, which feeds the live map. That broker is the OpenTrafficMap server, and this page covers both directions — how data gets there, and how to read it back. text/html 2026-08-14T22:06:47+00:00 Anonymous (anonymous@undisclosed.example.com) http://wiki.opentrafficmap.org/en_alt:start?rev=1786745207&do=diff OpenTrafficMap OpenTrafficMap is an open project that visualises C-ITS data — the messages that traffic lights, trams, buses and modern cars already broadcast unencrypted today. Volunteers run small receivers, the receivers report what they hear, and the result is a live map. text/html 2026-08-14T22:06:48+00:00 Anonymous (anonymous@undisclosed.example.com) http://wiki.opentrafficmap.org/en_alt:your_node?rev=1786745208&do=diff Your Node The self-service portal is a small web interface for a single receiver. It is where you name your node, decide whether it appears on the map, adjust the LEDs and look at what it has been hearing. This page is about the things you click. The machine side — the broker, the topics, the wire format — is on