"Manfred Brenneisen" <[email protected]> writes: > Thinking about maxspeed:practical, which can be used to initialize > maxspeed in some cases, I thought about rural areas, which do not have > any maxspeed, or maxspeed:practical information included in OSM data:
I think we do need tags for maximum speed that tends to be reasoable typical speed one can go > The new curviness() function (useful for ways). > > Such a function could e.g. return the sum of direction change at every > point, divided by the way's length. > > This could give an estimation for the maximum practical speed. This could be useful to drop the speed absent tags, but I would worry that it would be very sensitive to how well the road is represented. As a completely alternative approach, one could process tracks to obtain maxspeed:typical values for ways. A related concern is if some ways (the more commmonly-used ones) are tagged, then the untagged, even scarier roads will be preferred by routing.
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