I have always thought about this.

Training cars with AI driving seems not really needed. to some extent yes, but no need to be increadibly smart like a human.

And with the same amount of money that costs to train the models, you can convert the traffic lights and traffic signs to be able to communicate with cars, and have cars talk to each other and you would technically not need an AI.

Why train an AI model to read traffic lights and get them wrong 3% of the time, if the traffic light can send a code to the car through directly.