Who is sending C-ITS?

Extracted from the more detailed German page verbreitung, which also lists the individual sources.

Only vehicles with ITS-G5 (WLANp / 802.11p, 5.9 GHz) broadcast CAM/DENM messages via direct radio and can therefore be picked up by RSUs and receiver stations. The cellular-based hazard warning systems of other manufacturers (Mercedes, BMW, Ford, Volvo, Audi) run through manufacturer clouds and do not appear on direct radio.

By far the largest ITS-G5 fleet: more than 2 million vehicles produced with Car2X for Europe (as of Oct 2025); the ADAC now even cites more than 2.3 million. Initially standard equipment, but since 2024/2025 only optional in most model lines — currently standard only in the ID.7. Car2X can be switched off in the vehicle, and messages are sent using changing pseudonyms.

• Golf 8 (since late 2019, standard from market launch — the first mass-produced ITS-G5 vehicle ever; optional since facelift 8.5)
• ID.3 (since 09/2020), ID.4 (since late 2020), ID.5 (since 2022) — standard until early 2025, optional since then
• ID.7 / ID.7 Tourer (since 2023, still standard)
• ID. Buzz (since 2022)
• Multivan (T7)
• Tiguan III (since early 2024; standard only in model year 2024, optional afterwards)
• Passat B9 (since early 2024)
• Tayron (since 2025)
• T-Roc II (since late 2025) — the T-Roc I did not have Car2X

• Born (optional in the Tech Pack M/XL; according to the 2023 ADAC manufacturer survey, only about 4,800 units delivered)
• Tavascan and Terramar (optional)

• Škoda: no ITS-G5, not even in the Enyaq/Elroq (MEB) — instead cloud-based “Local Hazard Information”; a real C2X was announced in 2022 but has not materialized so far
• Audi: no ITS-G5 in Europe — hazard warnings only via cellular (Audi connect package; latency 1–2 minutes according to the ADAC)
• Seat: no offering

For distinction — some of these systems are also marketed as “Car-to-X”, but they use vehicle-to-cloud-to-vehicle communication over cellular networks:

• Mercedes-Benz: “Car-to-X” via cellular since 2013, partly standard depending on the model line
• BMW: “Local Hazard Warning”, cloud-based (HERE), fleet-wide since about 2020
• Ford: “Local Hazard Information”, standard in all EU models with the 4th-generation modem (since 09/2019); latency 20–60 s
• Volvo: “Connected Safety” (hazard-light and slippery-road warnings), standard from model year 2020, 4G
• According to the 2023 ADAC manufacturer survey, no Car2X offering at all: Renault, Dacia, Stellantis, Hyundai, Kia, Toyota (Europe), Nissan, Mazda, Mitsubishi, Suzuki, Subaru, Polestar, Aiways, Ora

• Cadillac CTS: V2V via DSRC, standard in model years 2017–2019 (US/Canada only), discontinued with the end of CTS production. In 2020, the FCC reallocated the upper 5.9 GHz band — DSRC is effectively dead in the USA, and the transition is moving towards C-V2X.

• Toyota “ITS Connect”: optional since 2015 in the Crown and Prius, later in further Toyota/Lexus models; uses its own 760 MHz band (V2V + V2I with traffic lights), Japan only, incompatible with ITS-G5.

• State-driven rollout based on C-V2X (direct mode PC5, also 5.9 GHz, but incompatible with ITS-G5). First production vehicle: Buick GL8 Avenir (SAIC-GM, from late 2020); since then numerous models by Chinese manufacturers with factory-fitted C-V2X, including the Hongqi E-HS9.

Typical stationary senders (RSUs - Road Side Units):

• Motorways: ASFINAG has equipped the Austrian motorway network with C-ITS on a large scale (ASFINAG blog, C-ITS Deployment Group); in Germany, the Autobahn GmbH is rolling out C-ITS as well (autobahn.de)
• Car2X traffic lights: e.g. Vienna (wien.gv.at), Kassel, and other C-Roads pilot regions
• Public transport: buses and trams with OBUs — e.g. Klagenfurt with 12 RSUs, 74 OBUs in scheduled buses, and 3 OBUs in automated shuttles; bus prioritization via C-ITS in Hamburg; tram and bus projects in Graz
• plus roadworks warning trailers, toll gantries, and emergency vehicles from the various C-ITS projects

A regularly updated list of the pilot regions in Germany and Austria (with sources) can be found on the German page verbreitung.

C-ITS packets are transmitted unencrypted, but they can be cryptographically signed. Vehicles protect privacy by sending with changing pseudonyms instead of fixed identifiers.

Any vehicle you receive via direct radio around here is almost certainly a VW (or a Cupra Born with the Tech Pack) — plus special-purpose and commercial vehicles from the C-ITS projects (scheduled buses, safety trailers, emergency vehicles).