V2V allows vehicles to send and receive from each other information such as location, speed and direction of travel. V2I shares information about traffic signal phase, road attributes and surface conditions. Each has the potential to mitigate traffic collisions and congestion. Together, they can be integrated with active safety features, such as forward collision warning and side blind zone alert, already available on many production cars.
AutoInformed.com on Connected Vehicles V2V or V2I Telematics