2014-09-09 17:47 GMT+02:00 Martijn van Exel <m...@rtijn.org>: > I'm of the opinion that wherever the speed limit is just the default for > that road class, it should not need to be posted at all. Any data user can > then infer limits.
I don't know how this is handled in the US, but in Europe you will definitely need explicit speed limits because there is no road class in OSM that represents the needed properties. In Germany and Italy (and likely in many other countries as well) for instance there is a distinction between "inside settlement" and "outside settlement". Now not all residential roads are inside a closed settlement, and not every settlement is considered a settlement for the purpose of this law. The actual limits get set by the city_limit signs, which do not correspond to actual settlement boundaries but are put where the traffic planners think you should slow down (i.e. even if we mapped places in osm in all instances as areas, this place area would not correspond to the area with "urban" city limit). Besides this, there is another issue: when a key in osm is missing, you will not know if it is missing (here maxspeed), you will not know if it is missing or if the default should apply. Both are IMHO strong arguments to map also "default" (i.e. implicit, not sign-posted) speed limits, while the dataconsumers (e.g. routers), will of course need default values for road classes, especially for the cases of missing maxspeed information. cheers, Martin
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