On Sun, 4 Aug 2019 at 15:51, Florian Lohoff <f...@zz.de> wrote: > > Where do you take this assumption from? I have never heard before that > residential may not be used for through traffic? >
Many residential roads are cul-de-sacs. Dead ends. Not classed as through roads because they don't lead anywhere except the houses that are on them. Others can be used as routes from A to B but there are other routes that are shorter/wider/faster or some combination of those. And then there are tertiary (or higher) roads which lead from A to B but which also have houses along them. A cul-de-sac, which many residential roads are, can never be used by through traffic. Roads used by through traffic can have houses on them. It is useful to make a distinction in a way that makes sense. Of course, the situation is not the same in all countries. Many towns and cities in the US are laid out in a grid plan and most residential roads can carry through traffic. So the (unwritten) rule isn't so much that residential roads may not be used for through traffic but that if (in normal circumstances) it's used for through traffic then it's not a residential road even if there are houses along it. You could make a case that some roads can be both, but we don't have a way of tagging that situation in a way that is widely understood by data consumers, with routers being the most important type of data consumer to consider. -- Paul
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