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

[Ben Laenen]

On Thursday 21 May 2009, Radomir Cernoch wrote:
> Ben Laenen píše v Čt 21. 05. 2009 v 17:54 +0200:
> > So while it seems to be a polygon vs tags on ways discussion:
> >
> > I wonder what people have against using relations to combine all
> > roads in one built-up area, or one maxspeed zone, or some other
> > kind of zone. It's really the cleanest option and allows for
> > additional tags like a name, and it allows everything to be more
> > clearly defined, and allows for a method which is much more
> > flexible and allows for extended properties.
>
> How would a typical city look like? All 80 km/h roads in one relation
> and all 50 km/h roads in another relation? Or one relation per
> suburb?

A typical city here would look like all roads inside the built-up area 
inside one relation, and when there are roads inside it with another 
speed limit, tag those ways with maxspeed.

And for zone 30's inside built-up areas: each zone 30 will have its 
relation as well, and due to a simple precedence rule (a relation with 
zone=built-up area has less precedence than other relations) the speed 
limits are known there as well.


> And what about while countries: all rural 90 km/h roads in one
> relation?

No, because there's no special property on those roads. Those wouldn't 
be tagged with anything or wouldn't be a member of any relation if 
there are no speed limits signed on that road.

Ben