[OSM-newbies] Speed Limits

[John F. Eldredge]

Roger Calvert <roger at rogercalvert.me.uk> wrote:

> As far as I can see, the only way of solving this for single
> carriageway 
> roads is to introduce modified tags along the lines of 
> maxspeed:northbound (or south-, east- or westbound). Either direction
> on 
> any road segment can be matched to one of these, and most (but not
> all) 
> can be matched to two.
> 
> Roger
> 
> On 23/01/2013 11:13, Richard Hartmann wrote:
> > On Tue, Jan 22, 2013 at 2:29 PM, Philip Barnes <phil at trigpoint.me.uk
> 
> > <mailto:phil at trigpoint.me.uk>> wrote:
> >
> >      You would only need to do that on a single carriageway road.
> The
> >     A995 is dual-carriageway so its just a case of tag each
> >     carriageway with its speed limit.
> >
> >
> > Indeed. Thanks for pointing that out.
> >
> >     I have never seen a single carriageway road with different
> limits
> >     in each direction.
> >
> >
> >
> http://www.openstreetmap.org/?lat=48.76677766442299&lon=9.183344542980194&zoom=18
> >
> > That bend is 40 km/h going south, 50 km/h going north.
> >
> >
> > Richard
> >
> >
> > _______________________________________________
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> > newbies at openstreetmap.org
> > http://lists.openstreetmap.org/listinfo/newbies
> 
> -- 
> ------------------------------------------------------------------------
> 
> Roger Calvert
> ------------------------------------------------------------------------
> 
> 
> ------------------------------------------------------------------------
> 
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Yes, but if you have a winding road, you will have to split it up into many small segments, with a different set of speed limit tags every time the road curves.  You will also have ambiguous cases (if the road runs northeast to southwest, do you use the north/south pair of speed limit tags, or the east/west pair of tags)?

-- 
John F. Eldredge -- john at jfeldredge.com
"Reserve your right to think, for even to think wrongly is better than not to think at all." -- Hypatia of Alexandria
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