On Wed, Feb 20, 2019 at 9:45 AM Paul Allen <pla16...@gmail.com> wrote: > On Wed, 20 Feb 2019 at 12:25, Peter Elderson <pelder...@gmail.com> wrote: >> Residential just means it has housing along the road. > That doesn't necessarily work the other way around.
I'm glad you pointed that out. In all that has been said about highway classification over the years, I've often seen (and sometimes done) mistakes such as reverse causality (A therefore B equivalent to B therefore A) and correlation as causality (A and B often appear together, so if A then B). We need to be careful when interpreting and discussing the definitions, particularly when talking about other countries where people have different assumptions. Sometimes even redundantly clarifying in the wiki that the reverse is not true helps avoiding this kind of confusion. The only type of road that by definition cannot have direct access to private properties is highway=motorway. In the case of unclassified, the wiki says their > primary < purpose is to connect hamlets, villages and towns. So they may have houses, but access to them is not their primary function in the highway system as a whole. The wiki says: "From experience you know that the road is frequently and legally used as a through route or to reach a (non-farm) workplace or tourist attraction." and "The definition of this tag evolved from a scheme to describe the rather populated British countryside, where most of the public roads are paved because they also carry much non-agricultural traffic. The name derives from the official U classification used by UK local councils, but the OSM tag has also been applied to roads which carry other official classifications: the D and C categories in particular. This has happened because these three official classifications are typically not signposted and so have historically not been available to OSM mappers; nevertheless, the tag is still useful for marking low-importance minor roads." [1] [1] https://wiki.openstreetmap.org/wiki/Tag:highway%3Dunclassified -- Fernando Trebien _______________________________________________ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging
