[OSM-talk] zones for motorway/in town/outof town? - borders are different

[marcus.wolschon at googlemail.com]

On Wed, 20 May 2009 12:00:31 +0200, MP <singularita at gmail.com> wrote:
>>  a) motorway: that's very clear, therea are no or very high limits.
>>  b) "city" areas with limited speed and some restrictions
>>  c) everything else, mostly out of town.
> 
> In Czech republic there are different rules for motorways inside
> "city" area (maxspeed=80) and outside (maxspeed=130). So case d)
> 
> identifying a) is easy and if we are able to identify what is inside
> and outside city - b), we can identify roads and motorways
> inside/outside city.

I would like everyone to realise, that we are talking about
3 _different_ city-limits:

a) the large administrative area that "belongs" to the city
b) the area that has the given place in postal addresses
c) the smaller area where driving rules for "build up area" apply

Currently we have:
* place-polygon or place-node without such a polygon and assumed radius
* administrative area (admin_level) - maps easily to (b)
* some landuse-polygons that have no direct relation to a b or c

Marcus