Oh. Personally I learned how to drive in good weather first.

If the road markings are visible, do you use them? Or do you ignore them and never use them since they may sometimes be covered?

The former?

So makes sense for an automatic system to do the same?

> a light coating of crystallized water

Do you mean snow?

Not if the roads are mapped. You have prior knowledge of exactly where the markings are even if it’s not entirely visible due to rain.