The way they're on sign-posts and everything is great. Although, the notion of the colors painted on trees and what they mean (Red/Blue/Green/Yellow) is somethi

The way they're on sign-posts and everything is great. Although, the notion of the colors painted on trees and what they mean (Red/Blue/Green/Yellow) is something that I've definitely come across in the US. Specifically, in areas near Boy Scout Reservations.