It doesn't work if the road is not straight for it's entire length. It takes the start point of a road and the end point and assumes the road is a straight line between. It should work on individual segments of roads, not whole connected ways. It should only include further segments if they are on the same angle to some threshold. It should include segments from other roads if they are connected and aligned (maybe the road changes name at a crossroads).

It could even include disconnected segments if they align and are nearby but there is a discontinuity in between - sometimes a road junction is drawn in detail in Open Street Map - Often if you are stood at one end of the road you can see through and past the junction.

A beautiful project by fellow Recurse Center alums Victoria Ritvo and John Pribyl!

Is there actually reason to not just check all the countries in the list in the app store?

Not really?