In the future, vehicles could have their FSD augmented by direct comms with each other, in a trustless way. If the entire traffic network ended up interconnected, it'd behave as a single system, approaching 100% self-awareness.
Obviously, no ordinary human drivers could get anywhere near that level of situational awareness, nor ability to coordinate in parallel. All they have is a small cone of vision/hearing, a bit of sensor augmentation, and little else.