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[mkgmap-dev] [PATCH v2] Move maxspeed calculations to style file

From Greg Troxel gdt at ir.bbn.com on Mon Sep 2 14:06:25 BST 2013

"Manfred Brenneisen" <Manfred.Brenneisen at gmx.net> 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&#39;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
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