Taiwan — an industry roadside profile, and an unanswered spectrum question.
Taiwan has a published, freely downloadable roadside profile covering ten C-ITS message types. It is a real document and it is worth reading. It is also an industry association standard, not a national radio regulation, and Taiwan’s 5.9 GHz authorisation is a separate question this research pass did not manage to answer.
Ten message types, published free, by an industry association.
The Taiwan C-ITS Roadside Open Standards — TCROS — were published on 16 April 2024 by the Taiwan Intelligent Transportation Industry Association. The standard specifies communication between signal controllers and roadside infrastructure, and covers ten message and protocol items: SPaT, V2X MAP, SRM, SSM, TIM, PSM, BSM, RSA, EVA and the TCROS use profile. It is freely downloadable from the publisher.
As roadside deployment material this is genuinely useful: it is the kind of concrete, published interface profile that most markets do not have, and it covers the signal-controller boundary that tends to be where infrastructure projects actually stall. What each of those messages carries →
An industry open standard is not a national radio regulation.
TTIA is an industry association, not a government regulator. TCROS was developed through working groups with government participation, which is a different thing from being issued by government, and no source consulted for this page establishes it as a binding national instrument. This site therefore records it as a published industry roadside profile with a voluntary binding effect, and does not present it as a national radio regulation.
It is also worth being clear about the layer. TCROS is an application and message profile. It says nothing about spectrum, nothing about radio access technology and nothing about device authorisation — a message profile and a transmission permission are different documents answering different questions, and the catalogue keeps them in separate document types for exactly this reason.
Taiwan's 5.9 GHz authorisation is not established here.
The spectrum position was checked independently of TCROS, and the check did not succeed. The National Communications Commission reorganised its website and the former frequency-allocation pages now return an error, so no Taiwanese 5.9 GHz authorisation or device-approval instrument was located in this pass.
That is recorded as an unresolved question, not as an absence. Taiwan may well have an instrument we did not reach; nothing on this page should be read as saying it does not. Before any device or deployment decision, go to the NCC's current frequency allocation table and its type-approval technical specifications directly. The catalogue's full list of open questions →
The documents, one record each.
Each identifier links to its canonical record in the V2X standards library, where the edition, dates, band, access conditions and verification note are held once. Status and binding effect are separate: a published document is not automatically a legal requirement.
| Document | Title | Type | Status | Binding effect |
|---|---|---|---|---|
| TCROS 2024 | Taiwan C-ITS Roadside Open Standards (TCROS) 2024 | Messages | Published final | Voluntary |
Where this fits.
Message sets
SPaT, MAP, SRM, SSM, BSM and the rest — what each message carries and at what rate.
Asia-Pacific
Japan, South Korea and Australia, and the instruments behind each position.
Standards library
Every document in this catalogue, filterable by country, type, status and technology.
Last reviewed: 29 September 2026. The TTIA publisher announcement was read on that date; the NCC spectrum position remains unresolved.
Questions this page answers.
What is TCROS 2024?
The Taiwan C-ITS Roadside Open Standards, published on 16 April 2024 by the Taiwan Intelligent Transportation Industry Association. It specifies communication between signal controllers and roadside infrastructure across ten message and protocol items — SPaT, V2X MAP, SRM, SSM, TIM, PSM, BSM, RSA, EVA and the TCROS use profile — and is free to download.
Is TCROS a Taiwanese national regulation?
No, and it should not be presented as one. It is issued by an industry association rather than by a government regulator. It was developed with government participation, which is a different thing. Nothing consulted for this page establishes it as a binding national radio regulation, and this site does not describe it as one.
Which frequency band has Taiwan authorised for V2X?
Not established in this pass, and we will not guess. TCROS is an application and message profile and authorises no radio. The National Communications Commission reorganised its website and its former frequency-allocation pages now return an error, so no Taiwanese 5.9 GHz authorisation or device-approval instrument was located. This is recorded as an open question, not as an absence.
Does TCROS say anything about C-V2X or DSRC?
It is a message and application profile, so the radio technology beneath it is a separate layer. The publisher announcement describes the message set and the signal-controller interface, not a radio access technology, and no technology decision is recorded here on its basis.
Last updated 2026-09-29 · Technical reference maintained by Ambimat Electronics, Ahmedabad, India. Corrections: neel.shah@ambimat.com