[mkgmap-dev] Road speed through urban areas

Tue Jul 7 14:34:42 BST 2020

Hi
Seems like a good idea.
In the British Isles I find 359 maxspeed:advisory and no
maxspeed:practical.
maxspeed:practical was rejected:
https://wiki.openstreetmap.org/wiki/Proposed_features/Practical_maxspee
d
but seems to be accepted:
https://wiki.openstreetmap.org/wiki/Key:maxspeed:practical
I'll do a patch for this sometime soon.
Ticker
On Tue, 2020-07-07 at 08:28 -0400, Greg Troxel wrote:
> > The mkgmap default style doesn't understand maxspeed:practical.
> 
> Thanks.  I was unclear on this.
> 
> I would suggest that mkgmap should in the default style use the first
> one of these that is defined:
> 
>   maxspeed:practical
>   maxspeed:advisory (yellow sign, in the US, not a requirement, but
> advice)
>   maxspeed (legal limit)
> 
> I am unclear on if advisory is used in non-US places.  Here we often
> e.g.  have yellow "45" signs on curves on roads with "55" limit
> (white)
> signs, and on exit ramps (slip roads in en_GB, *_link in osm).
> Sometimes the advisory speeds are sensible, some times they are way
> too
> low and occasionally they are too high.  A great case for using
> practical to fix them.
> 
> 
> I would expect this to be quite necessary in rural UK and IE, as it
> seems there is a tradition of 100 km/h or 60 mph outside town
> centers,
> but at times roads often narrower/twisty such that at least I didn't
> think it wise.
> 
> (The US doesn't do this so much; very rarely is the legal limit
> unsafe.
> There are dirt roads where :practical should be used, though.)
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