By way of introduction to some of the potential benefits of V2x technology, here’s a video from NXP with some handy tips on how to utilise vehicle-to-infrastructure communication:
That video dates back to 2012 [and is now deleted!}. So here is a much more up to date one:
Here’s a more recent one, extolling the virtues of vehicle-to-vehicle communication:
Meanwhile, and bang up to date, here’s u-blox on the potential benefits of V2V for passenger vehicles: