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.

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.

1. Get a receiver, or build one: Receivers
2. Put it somewhere useful: Placement & Outdoor
3. Name it and put it on the map: Your Node

If you pick up something interesting — a new city, an unusual sender, infrastructure that was not known to be live — add it to Coverage. The conventions for entries and the difference between a documented deployment and a sighting are explained there.

Register a wiki account and edit. Corrections, missing details and new pages are all welcome, and the gaps are marked: search for TODO to find the places where somebody's knowledge is missing rather than somebody's writing.

A few conventions:

• Long pages with sections, rather than many small pages. If something is a paragraph, make it a section.
• Plain, factual language. No marketing tone.
• Say where a number comes from. Measurements, prices and dates age; a source lets the next person check.
• Prefer linking to a repository or a datasheet over copying its content, except where a short summary genuinely saves the reader a trip.

Firmware, hardware and the map are developed in the open. See Related projects below.

This wiki is written in English. C-ITS is a European technology, the deployments span several countries, and the people building receivers are not all German speakers.

One deliberate exception: the imprint below stays in German, because it is a legal text under Austrian law.

OpenTrafficMap is run by a registered non-profit organization, and everyone involved works on a voluntary basis.

Receivers are passed on at cost — we do not make a margin on the hardware. The organization holds a bank account, which is what makes it possible to accept payment for orders and to receive donations at all.

TODO: Donation details — bank account, or whatever channel is preferred — are not documented anywhere. If donations are welcome, this is the place to say how.

Everything is on Codeberg: codeberg.org/opentrafficmap

• its-g5-receiver — the receiver hardware: KiCad sources, and Gerber, BOM and CPL files in the releases, plus the OpenSCAD enclosure
• its-g5-receiver-firmware — the firmware for the receiver
• cits-to-json — a C-ITS parser in Rust, intended to replace the Wireshark-based decoding
• cits-wireshark-bridge — decoding via tshark, producing JSON

Described in detail, with their trade-offs, under Other receiver projects:

• cits-to-go — receiver plus Android app, portable
• simple-its-g5-receiver-firmware — minimal firmware, USB serial to PCAP
• v2x2map — standalone receiver with its own Android app and map
• avm-fritz3390-802.11p-otm and openwrt-otm-bridge — a FRITZ!Box as a receiver
• esphome-its-g5 — an ESPHome component for Home Assistant users
• esp32-spi-eppp-server and the robbi5 fork — a Wi-Fi gateway over SPI

• KiCanvas — view the receiver's schematics in a browser, live from Codeberg, without installing KiCad

• Wikipedia: C-ITS (German)
• C-ITS Deployment Group: C-ITS is now ready for use in Germany (04/2021)

• Federal Ministry: C-ITS strategy for Austria
• ASFINAG: C-ITS/Car2X as a key technology (03/2026)
• ASFINAG connects roads with vehicles on a large scale in Europe (09/2020)
• City of Vienna: Cooperative Intelligent Transport Systems
• ITS Vienna Region
• VCÖ: C-Roads Austria 3 — Graz, Klagenfurt, Vienna (2025)
• Video: How to Improve Public Transport with C-ITS — Vienna (05/2026)

Content in this wiki is published under CC BY-SA 4.0. You may reuse and adapt it, as long as you credit the source and share your version under the same licence.

The software and hardware repositories carry their own licences; check each repository.

Legal notice under Austrian law, in German.

OpenTrafficMap - Verein für intelligente Verkehrssysteme
ZVR 1221756787
Zuständigkeit Landespolizeidirektion Steiermark, SVA 3
Zustellanschrift: 8010 Graz, Conrad-von-Hötzendorf-Straße 70b/49
peter@opentrafficmap.org

Statutenmäßige Vertretungsregelung:
Der/die Obmann/Obfrau vertritt den Verein nach außen. Schriftliche Ausfertigungen des Vereins bedürfen zu ihrer Gültigkeit der Unterschriften des/der Obmanns/Obfrau und des Schriftführers/der Schriftführerin, in Geldangelegenheiten (vermögenswerte Dispositionen) des/der Obmanns/Obfrau und des Kassiers/der Kassierin. Sollte der Vorstand nur aus zwei Mitgliedern bestehen, müssen schriftliche Ausfertigungen immer von beiden Vorstandsmitgliedern unterschrieben werden.

Vereinsregisterauszug: Vereinsregisterauszug
Statuten: Statuten