[cbhl]

That's cool, but the little reflective markers don't get used in places that get snow (like Canada) because of snow plows.

[lttlrck]

Recessed markers are becoming increasingly common

https://www.azdot.gov/mobile/media/blog/posts/2013/01/25/tra...

Edit: anecdotally, in the NE US.

[sanswork]

The Toronto area had them everywhere last time I was there.