How do V2X communications help connected cars share information?

When connected cars talk to each other or their surrounding infrastructure, this is referred to as vehicle-to-everything, or V2X, communications. When connected cars explicitly communicate with another vehicle, we call this vehicle-to-vehicle (V2V) communications, while connected cars talking to roadside units, traffic lights, road signage and so forth is called vehicle-to-infrastructure (V2I) communications.

In order to support V2X communications — either V2V or V2I — there are two approaches to create reliable wireless links between both ends of the communications channel, and each of these approaches has its own pros and cons.