AmbiRSU — roadside infrastructure, treated as infrastructure.
V2X networks need roadside units at intersections, toll plazas and highway on-ramps. India has effectively none, and no domestic manufacturer. A roadside unit is permanent outdoor infrastructure carrying real-time road-safety communications, which makes it a rather different engineering problem from a piece of traffic equipment that only reports upward.
AmbiRSU is a development platform, and we are looking for collaborators and launch customers — road authorities, tolling and transit concessionaires, telecom operators, city ITS programmes and integrators. If you are scoping a corridor, an intersection programme or a pilot, that is the conversation we want.
A compromised roadside unit is a weapon, not a fault.
An RSU that broadcasts unsigned messages, or whose firmware can be silently replaced, can inject false traffic alerts, spoof emergency-vehicle signals, or disable collision warnings across an entire corridor — continuously, from a fixed and well-chosen position, to every vehicle in range.
It is also a trusted insider in the PKI. Roadside units hold application certificates with service-specific permissions that vehicles do not have: an RSU may sign SPaT, MAP and IVI messages; a vehicle may not. Compromise it and you inherit those permissions. How those permissions are encoded →
Eight requirements, and how the platform meets each.
| Requirement | AmbiRSU implementation |
|---|---|
| PKI certificate management | AmbiSEC secure element manages V2X certificates; automated issuance, renewal and revocation over the backhaul |
| Signed messages | Every V2X broadcast signed with ECDSA; relays validate authenticity before forwarding |
| Secure OTA | Firmware authenticated by the secure element before installation; rollback protection on failed update |
| Hardware-backed credential storage | RSU identity keys and V2X certificates held in the hardware-isolated secure element |
| Secure boot | Boot sequence cryptographically verified before the unit becomes operational |
| Tamper detection | Anti-tamper mesh on the PCB triggers alarm and credential wipe on physical breach — critical for unattended roadside deployment |
| Unique device identity | Hardware-bound identity provisioned at manufacturing under HSM custody, SCP03-wrapped |
| Application permissions | Message permissions scoped in the certificate — an RSU signs only the message types its service-specific permissions authorise |
That last row is worth dwelling on. Permissions are carried in the certificate itself, as a PSID and SSP pair, so what a device is allowed to say is enforced cryptographically rather than by configuration. Separating credentials by application is therefore a design decision taken once, at architecture time — it is not something that can be added later in software.
Outdoor electronics designed for defence and space applications.
Ambimat designs ruggedised outdoor electronics for defence and space applications through AmbiSpace and AmbiDefence — IP-rated enclosures, thermal management, vibration tolerance. AmbiRSU applies the same security architecture as AmbiOBU, adapted for fixed infrastructure deployment with a multi-sensor environmental payload and cellular backhaul.
The sensor stack and full specification are pending client-supplied requirements, and no sensor table is published until they are confirmed.
An open question in India, and one worth engaging publicly.
Our position: authorisation should be a licence with a security bar, not a procurement footnote.
Plausible operator classes: licensed telecom operators, who already hold spectrum, tower estate, backhaul and 24×7 network operations discipline; cloud and software infrastructure providers, who can run the ITS application layer, edge compute and credential-management back end; and highway, tolling and transit concessionaires, who own the roadside asset, power and access rights on the corridors that matter first and have a commercial reason to maintain the units.
Conditions of authorisation should include certified, MTCTE-tested equipment with a tamper-resistant secure element and secure boot; enrolment as an end entity under an approved Root CA with an audited Certification Practice Statement and no self-signed roadside trust; physical-security and tamper-response obligations at the pole with incident-reporting SLAs; and strict separation of safety-message permissions from commercial-service permissions. Where the Indian position currently stands →
A development platform, not a product you can order.
AmbiRSU is not in production deployment. Engagement is co-development against a real site.
What we bring: ruggedised outdoor electronics design and manufacturing from the AmbiSpace and AmbiDefence programmes; multi-sensor PCB integration; cellular backhaul design; the AmbiSEC security layer with tamper detection, secure boot and hardware-held credentials; and OTA and provisioning infrastructure.
What we are looking for in a partner: a corridor, an intersection set or a campus to design against; the traffic-controller and command-centre systems it has to integrate with; and the conformity regime it will be tested under. The eight integration surfaces →
Work we take on beyond the platform itself.
Commissioned development work around roadside infrastructure — custom RSU hardware to a published specification, sensor payload integration, secure-element and credential-lifecycle integration into an existing RSU design, provisioning-line design, and firmware and OTA work for deployed roadside fleets.
If you are building roadside infrastructure and need a hardware partner rather than a finished box, reach out. Commercial arrangements — co-development, licensing, contract manufacture, joint pilots — are all things we will discuss directly.
Where this fits.
V2I
What an RSU broadcasts, and the eight systems it has to touch.
AmbiSEC
The secure element holding the roadside credentials.
India regulation
Why RSUs are excluded from the OBU licence exemption.
SCMS vs CCMS
How each trust model treats roadside stations and their permissions.
Threats and attacks
RSU compromise as a threat class, with its countermeasures.
AmbiOBU
The vehicle-side counterpart, on the same security architecture.
Scoping a roadside deployment or an RSU development programme?
Bring the corridor, the controller integration and the conformity regime. We will bring the hardware baseline and the security architecture.