V2X explained
Vehicles that talk to streets.
V2X (Vehicle-to-Everything) is a set of European standards that let vehicles, traffic lights, and road infrastructure exchange safety and efficiency information in real time.
It's not a future concept — it's deployed today at intersections across Europe. The challenge is connecting it to the traffic systems cities already have. That's what SkyV2X does.
The messages
Nine types of information, each with a specific job.
Every V2X message follows a European standard. Here's what each one does in plain language.
CAM
Cooperative Awareness
Vehicles broadcast their position, speed, and heading 10 times per second — other vehicles and infrastructure know where they are.
DENM
Hazard Notification
When something unexpected happens (accident, ice, roadwork), nearby vehicles are alerted automatically.
CPM
Collective Perception
Sensors on infrastructure share what they see — pedestrians, cyclists, obstacles — with nearby vehicles.
VAM
VRU Awareness
Pedestrians and cyclists carrying a smartphone become visible to connected vehicles before they cross.
MAPEM
Intersection Topology
The geometry and lane layout of an intersection is broadcast so vehicles understand the road ahead.
SPATEM
Signal Phase & Timing
Traffic light status — current phase, time to green — sent to approaching vehicles in real time.
SREM
Signal Priority Request
Buses, trams, or emergency vehicles request green-wave priority as they approach an intersection.
SSEM
Priority Status
The intersection responds: priority granted, denied, or pending.
IVIM
Infrastructure Information
Speed limits, road conditions, and regulatory info pushed directly to vehicles from roadside units.
In practice
What does this look like on the street?
Green-wave for public transport
Buses and trams request priority as they approach. Traffic lights adjust. Average travel time drops. Passengers arrive on schedule.
Pedestrian safety at crossings
A smartphone in a pedestrian's pocket broadcasts their presence. Approaching connected vehicles receive the alert before the driver sees them.
Emergency vehicle preemption
Ambulances and fire trucks clear their path automatically. Intersections go green ahead. Response times improve without endangering other road users.
Roadwork and hazard warning
When road conditions change — ice, accident, lane closure — connected vehicles receive the notification automatically, hundreds of meters in advance.
For engineers
Want to go deeper?
We maintain a public V2X message decoder that runs directly in your browser. Paste an ETSI hex stream and see the decoded result — no backend, no registration. All 9 message types supported.
Open the decoder