Stellantis and HAAS Alert — 1.8 million receivers, no transmitters.
This is the largest vehicle-to-everything (V2X) activation in North America by vehicle count, and it is routinely described as vehicle-to-vehicle. It is not. Every alert originates from a professionally operated asset, and no passenger car in the fleet transmits anything.
Stated correctly it is more impressive than the misreading, not less: it is the clearest demonstration available that the first V2X value to reach scale is the value that does not depend on other cars being equipped.
Infrastructure and fleet V2X. Around 1.8 million receivers and no transmitters.
This is the largest V2X activation in North America by vehicle count, and it is routinely described as vehicle-to-vehicle. It is not. Every alert originates from a professionally operated asset — an emergency vehicle, a tow truck, a work zone, a highway gate, a disabled vehicle enrolled in a roadside programme — and travels through a commercial platform to the car over its own connection. No passenger car in the fleet transmits anything.
Stated correctly it is more impressive than the misreading, not less. It is the clearest demonstration available that the first V2X value to reach scale is the value that does not depend on other cars being equipped.
| Field | Verified position |
|---|---|
| Category | Infrastructure and fleet V2X, cloud-delivered |
| Announced | 23 May 2023 |
| Scale | More than 1.8 million compatible vehicles |
| Brands and model years | Compatible Chrysler, Dodge, Ram and Jeep vehicles, model year 2018 and newer. Not every 2018-or-newer vehicle — the source says compatible. |
| Markets | United States and Canada |
| In-vehicle feature | Emergency Vehicle Alert System, a standard feature of the manufacturer's infotainment system |
| Subscription | Not required for the basic alert |
| Alert originators | Emergency vehicles, tow trucks, disabled vehicles, work zones, arrow boards, highway gates and other connected roadway assets |
| Direct radio | None. All traffic routes through the platform. |
An existing in-car feature, connected to an existing alerting network.
Announced on 23 May 2023: more than 1.8 million compatible Chrysler, Dodge, Ram and Jeep vehicles from the 2018 model year onward, in the United States and Canada, receiving Safety Cloud alerts through the manufacturer's in-vehicle Emergency Vehicle Alert System. The qualifier matters: the figure counts compatible vehicles, not every vehicle those brands built from 2018. A driver approaching an active emergency vehicle, tow truck or roadway hazard receives an audible tone and an on-screen message, with no third-party application to download and no subscription needed for the basic alert.
What makes the deployment large is what it did not require. No new radio, no new antenna, no roadside estate, no spectrum decision, no regulator, and no other manufacturer's cooperation. The vehicles already had a connection and an alert-capable head unit; the emergency fleets were already enrolled in an alerting network; the work was integration. That is how a V2X service reaches a seven-figure vehicle count in a market where direct V2V fitment is zero.
One-way, fleet-sourced, platform-mediated.
Emergency or roadway asset
An ambulance or fire appliance responding, a tow truck working a shoulder, a work zone, an arrow board, a highway gate, a disabled vehicle in a roadside programme.
Commercial alerting cloud
Knows which assets are active and where, and determines which approaching vehicles should be alerted.
Mobile network
Delivery over the vehicle's existing connection.
Equipped vehicle
Audible tone and on-screen message. The vehicle never transmits an alert of its own.
Compare that with the diagram on the Volvo or Mercedes-Benz studies and one node is missing: there is no originating passenger car. The information flows in one direction only, from professional assets to private vehicles. That single structural difference is why this belongs in a different category from the cloud-mediated cooperative systems, even though the delivery leg is identical.
The economics are completely different, and better.
Vehicle-to-vehicle safety value scales with the square of fitment, because a warning requires two equipped vehicles in the same conflict. At low penetration that product is close to zero, which is why every early direct-V2V deployment paid full cost for negligible benefit.
Fleet-sourced alerting does not have that problem. The hazard sources are a small, professionally operated population that can be equipped deliberately and quickly — a city's ambulances, a state's work-zone equipment, a towing operator's fleet. Once they are transmitting, value accrues linearly in the number of receiving vehicles, and the first receiving vehicle gets the full benefit on its first day.
That asymmetry, not any technical merit, is why this deployment reached 1.8 million vehicles while direct V2V in the same market reached none. It is the same reason V2I services deployed before V2V services everywhere in the world. Why infrastructure services scale linearly · Why vehicle-to-vehicle does not
Three limits, and each of them is architectural.
| Limit | Why it follows from the architecture |
|---|---|
| No car-to-car warning | Passenger vehicles are receivers only. The vehicle braking hard ahead is not a hazard source in this system, and cannot become one without a transmit path. |
| No crash-imminent latency | Two network legs and a platform decision. Appropriate for an approaching emergency vehicle several hundred metres out; not for a collision-avoidance warning. |
| Coverage-dependent | No mobile signal, no alert. Rural and mountainous roads — where responder approach warnings arguably matter most — are the weakest coverage. |
One thing to watch, stated as a watch item rather than a finding. HAAS Alert has described a vehicle-originated capability — a stopped vehicle with hazard lights on automatically broadcasting a warning — as a feature of its Android Automotive product, announced 2 June 2026. That is a platform capability, not a verified vehicle deployment: no Stellantis vehicle has been verified as shipping it, and the 2023 integration studied on this page is receive-only. It is worth being precise about what it would and would not change if it did ship. It would mean an ordinary passenger car originating a hazard message, which moves the system from infrastructure-sourced V2X into cloud-mediated cooperative safety — the Mercedes-Benz and Volvo category. It would not make it direct V2V, because the path would still be cellular and still run through a platform. What that category looks like when it does ship
A further consideration is commercial rather than technical, and belongs in any procurement assessment: the alerting network is a private platform. Its coverage is the set of fleets that have chosen to subscribe, not a public safety infrastructure with a mandate. That is a perfectly ordinary way to run a service, and it makes availability a commercial variable rather than a regulatory guarantee — which is a different risk profile from a standards-based direct system, not a worse one.
Trust is established commercially, not cryptographically.
Neither the manufacturer nor the platform operator publishes a protocol-level security architecture for the integration, and this page does not construct one.
The structural position is nonetheless clear and is worth understanding, because it is genuinely different from the direct-radio model. A receiving vehicle in this system trusts the alert because it came from the platform, and the platform vouches for the alert because it admitted the sending fleet through a commercial onboarding process. Trust is a property of the business relationship, enforced at the platform boundary.
In a direct V2V system nothing like that exists. A receiver has milliseconds to decide whether an anonymous broadcast from an unknown vehicle should trigger a warning, with no network, no lookup and no authority to ask. That is the entire reason the public-key apparatus, the pseudonym certificates, the offline revocation lists and the misbehaviour detection literature exist.
Neither model is superior in the abstract. The platform model is far simpler to operate and works today; it also creates one commercial party whose compromise or withdrawal affects every participant. The direct model distributes trust and has no such party, at the price of an infrastructure that takes years to establish. A market designing a national framework is choosing between those two shapes, and should do so knowingly. The two public trust architectures compared · Why authentication is not enough
Equip the small population that generates the hazards.
Everyone designing a V2X programme starts from the same instinct: equip the vehicles. It is the instinct that produced two decades of stalled deployment, because the vehicle fleet is enormous, slow to turn over, and worthless until a large fraction of it is done.
This deployment inverts the question. Instead of asking how to equip a hundred million cars, it asks which small population actually generates the hazards worth warning about — and the answer, for a large share of the roadway casualty problem, is a few hundred thousand professional vehicles that are already fleet-managed, already connected, and already accustomed to being told what equipment to carry.
Three things transfer directly to a market such as India, which is currently designing fitment policy from a standing start:
- The hazard sources and the receivers are different populations, and can be equipped on different timetables. Ambulances, tow operators, road-maintenance fleets and public transport can be mandated quickly and cheaply, and deliver value to whatever receivers exist.
- Receive-only fitment is much cheaper than transmit-capable fitment — and it is what delivers the first tranche of value in every deployment in this section. A staged policy that requires reception before it requires transmission gets benefits years earlier.
- An emergency-vehicle alert is on India's own list. The draft Indian specification names emergency vehicle alert among its initial safety applications; this deployment is the largest existing demonstration of that exact function, delivered without any of the infrastructure India does not yet have. India's V2X framework
None of which changes the classification. It is not vehicle-to-vehicle, and it should not be counted as vehicle-to-vehicle. It is something else that works.
Designing a fleet or roadside V2X programme? Which population transmits and which receives is the first decision, and it determines the hardware. The RSU development kit
Where this comes from.
- HAAS Alert — Industry-leading V2X activation equips 1.8 million Stellantis vehicles with Emergency Vehicle Alert System, 23 May 2023. The vehicle count, the Chrysler, Dodge, Ram and Jeep brands, the 2018-and-newer model years, the United States and Canada markets, the alert originators, the platform path, and the standard-feature status with no subscription required for the basic alert.
- HAAS Alert — Stellantis becomes the first automaker to deploy Safety Cloud alerts. The original integration announcement.
- HAAS Alert — Safety Cloud for Android Automotive, 2 June 2026. The platform-level vehicle-originated stopped-vehicle capability, and the statement that it runs over existing cellular connectivity without dedicated V2X hardware. Cited for what the platform describes, not as evidence of any vehicle deployment.
External links are given so the figures can be checked at source. They do not imply any relationship with, or endorsement by, the organisations named. Stellantis, Chrysler, Dodge, Ram, Jeep and Uconnect are trademarks of Stellantis; Safety Cloud is a trademark of HAAS Alert. Both are used here to identify the system studied.
Where this fits.
The global V2V audit
Every manufacturer investigated, classified by architecture, with the comparison matrix.
Audi Traffic Light Information
The other infrastructure-sourced deployment, and what happened to it over time.
Cadillac V2V
Direct V2V in the same market, and why it reached no vehicles at all.
V2I
Why infrastructure-sourced services deploy first, everywhere, without exception.
City mobility
What a city-scale programme delivers, in the order the value actually arrives.
India regulation
Emergency vehicle alert is one of the four applications the draft Indian standard names.
Questions this page answers.
What is the Stellantis Emergency Vehicle Alert System?
An in-vehicle feature that gives the driver an audible tone and an on-screen message when they approach an active emergency vehicle, tow truck or roadway hazard. Announced on 23 May 2023, it covers more than 1.8 million compatible Chrysler, Dodge, Ram and Jeep vehicles from the 2018 model year onward in the United States and Canada, is a standard feature of the manufacturer's infotainment system, and needs no subscription for the basic alert.
Is the Stellantis and HAAS Alert deployment vehicle-to-vehicle communication?
No. The alerts originate from emergency vehicles, tow trucks, disabled vehicles enrolled in a roadside programme, work zones, arrow boards, highway gates and other connected roadway assets. They travel through a commercial alerting platform and reach the car over its existing mobile connection. The passenger vehicles are receivers only and never transmit an alert of their own, and there is no direct radio anywhere in the path.
Why did this deployment reach 1.8 million vehicles when direct V2V in the same market reached none?
Because the economics are different. Vehicle-to-vehicle value scales with the square of fitment, since a warning needs two equipped vehicles in the same conflict, so early adopters pay full cost for almost nothing. Fleet-sourced alerting equips a small professional population that generates the hazards, after which value accrues linearly in the number of receiving vehicles and the first receiver gets the full benefit immediately.
What can this architecture not do?
Three things, all architectural. It cannot warn about the car braking hard ahead, because passenger vehicles have no transmit path. It cannot support crash-imminent latency, because every alert crosses two network legs and a platform decision. And it stops working without mobile coverage, which is weakest on exactly the rural roads where responder approach warnings matter most.
How is trust established without certificates?
Commercially rather than cryptographically. The receiving vehicle trusts the alert because it came from the platform, and the platform vouches for it because it admitted the sending fleet through a commercial onboarding process. A direct V2V receiver has no such option: it has milliseconds to judge an anonymous broadcast from an unknown vehicle with no network to consult, which is why the public-key apparatus and pseudonym certificates exist at all.
Last updated 2026-09-08 · Technical reference maintained by Ambimat Electronics, Ahmedabad, India. Corrections: neel.shah@ambimat.com