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Not sure that a rebuild is necessary, could be a simple as beacons on the back of emergency vehicles, 'qr' coded signs, and reflective road markers. Tesla already detects traffic cones...

https://electrek.co/2019/11/07/tesla-autopilot-handle-constr...

>> Sounds great in practice but isn’t realistic in the slightest

And that's also why a "self driving" car isn't realistic.

I think the proper term for what we have now should, at most, be something more akin to "Assisted Driving Features" because right now it's far to blurry.

> would require every country to implement a very costly standard.

Thats what road are already. They are costly and they are mostly standard through out the world.