> Nobody wants to buy map data from sixty different countries, each in a different format, with inconsistent rules about what terms mean ("Oh, in Germany, this distinction does not exist, but instead ...")
Instead, you get a single inconsistent set of rules as to what the values of the tags mean. Is it highway=residential or highway=tertiary with abutters=residential? Which of the two sets of explanations as to what the values for highway= mean on Brazil should I use, or should I use a third one from somewhere else? If I have a two-way road with continuous lines in the middle (no overtaking allowed), should I use a single oneway=no way, or a pair of oneway=yes ways? Should buoys be marked with the simple set of tags, the complicated set of tags, or both at the same time?
(Sorry about the rant, but I fear at least half of the highway= ways I added are tagged incorrectly. And I still cannot see how the the six levels of highway= tag values, two of them being more primary than "primary", match the kinds of roads on the major urban area I live in.)