This place: https://maps.app.goo.gl/hfDcJek99whs9Ghu8

Cobblestone is an old technology, though. How does "state of the art" differ from what we can see on this street view?

I think someone can drive 80km/h on this one. Plus they should be super-slippery in rain, right?

I remember crossing Poland towards Lithuania some years back, and in some village 1h from the border had a 500m part with stones, and those stones used would force me to do 25-30km/h and not more, I feared that my tires would burst, also the noise was unbearable.