I dunno, knowing the exact relative velocity of the car in front of you seems like it could be useful and is something humans can’t do very well.

I’ve always wanted a car that shows my speed and the relative speed (+/-) of the car in front of me. My car’s cruise control can maintain a set distance so obviously it’s capable of it but it doesn’t show it.

If your car is maintaining speed of the car in front then the car in front is going speed that is showing on your speedometer.

Yes, that’s true, but I don’t see how that relates to my comment at all.

I said the relative speed. If the car is going the same speed as me then the relative speed is 0mph. I want to see that when I’m not using cruise control.

We are "designed" (via evolution) to perceive and understand the environment around us. The signage is designed to be easily readable for us.

The models that drive these cars clearly either have some more evolution to do or for us to design the world more to their liking.

Yes. I was talking why Tesla choose to use vision. Since they can't control designing the transport infra to their liking at least for now.

That's not a reason to only use vision.

I said one of the reasons. They probably did some cost analysis and realised it's not worth spending engineering effort on other modes when human drivers are able to drive around pretty much using only vision.

I didn't say it was the only reason. Re-read my comment.

> They probably did some cost analysis and realised it's not worth spending engineering effort on other modes when human drivers are able to drive around pretty much using only vision.

Humans and cars aren't equal so this is just incredibly misguided as a principle.