I expect this will be inevitable, but since the density of self-driving cars is so low, developing such a protocol is premature. Also, the over all design shou

I expect this will be inevitable, but since the density of self-driving cars is so low, developing such a protocol is premature. Also, the over all design should exist in such a way that it doesn't rely on such car to car communication. For example, if a person is standing in the road, or a deer jumps into the lane, the car should be able to react accordingly. Having a car-to-car protocol would be helpful for the average case, but since there are so many tricky edge cases, I suspect full autonomy being developed to its maximum potential may make it unnecessary.