[algas]

Yeah, the lights in the back of your car can warn of exactly four things:

- The car is going to turn left (one blinking yellow light) - The car is going to turn right (one blinking yellow light) - The car is stopping (three solid red lights) - An unspecified error occurred (two blinking yellow lights).

It's not exactly a high - bandwidth form of communication. Most of the purpose of the lights behind your car is to remind other human drivers of your continued existence. As you point out, some of this deficiency can be made up by not looking at them.

Imagine a world where you could automatically talk over an intercom with the driver in front of you about traffic conditions. I bet you'd find safer, better-informed driving. Self-driving cars make that theoretically easy and humanly pleasant.