[cpgxiii]

The problem with V2X (vehicle-to-vehicle and vehicle-to-infrastructure) is that it is impossible to make it secure. Lots of work has been done on V2X protocols and ideas of operations, and none of them solve the fundamental problem that no one has a clue as to how to make such a large scale system secure against hostile actors. At best, every car would have to be continuously solving a Byzantine Generals problem for all V2X inputs, and those "solutions" don't really solve the problem.

Either the car is capable enough of operating by itself that V2X information is non-essential, or it is an extortion and assassination machine waiting to happen. Think ransomware locking away your documents and family pictures is bad already? Try "pay us 10 bitcoins or you die in a car accident on your commute home today".