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

[Radomir Cernoch]

Hi,

I would like to ask about the proposed feature 'trafficzone'. If I
understand it right, it proposes to add a tag to _every_ highway and
_every_ road in the city. I'm afraid that this solution is highly
redundant in the amount of information and therefore it's likely that
someone will forgot to add the right tag.

In the Czech list we ended up with the following solution, which tries
to copy the legislation (which is a good starting point, I guess):

1) Every road is by default 'rural' road (speed limit 90 km/h).
2) Every highway has speed limit 130 km/h by default.
3) If a road is inside a polygon tagging the city limits,
   then its speed limit is set to 50 km/h. Such polygon might be tagged 
   by 'place', but the actual name of the tag is not important here.
4) If a road has different speed limit from rules 1) - 3), it is tagged
   with 'maxspeed=...'.

By this scheme it's easy to set the speed limits right very quickly on
most roads, because it only requires to add the polygon with 'place' tag
(or any other name we agree on). At the same time you can set the speed
limits as detailed as you want to.

The default speed limits and rules can be set differently from country
to country of course. For example in the Czech Republic, we would add a
rule 3.1: for every 'trunk' road in the city polygon, limit is 80 km/h.
And lastly the default rules differ for car/truck/...

However we have not discussed other countries. Germany seem to be
compatible with this system, but what about the rest of the world?

Regards,
Radek Černoch



Mario Salvini píše v St 20. 05. 2009 v 12:21 +0200:
> MP schrieb:
> >>  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.
> >
> > There was similar discussion on czech mailing list. One suggestion is
> > to use administrative boundaries. There was suggestion to use
> > landuse=residential, but that is not possible - often the "city" area
> > is not corresponding to landuse=residential. Suggestion for
> > administrative area is pretty good, but there are still some caveats -
> > sometimes the boundary follow the road and in few cases, sign for "end
> > of village" and sign for "beginning of village" from other side do not
> > match (so basically, one side of the road is "inside" the village,
> > while the other is not.)
> >   
> Would be cool, if you can add your czech traffic-zones to the proposal. 
> http://wiki.openstreetmap.org/wiki/Proposed_features/trafficzone
> >   
> >> (In practice, the test for a "built up area" seems to be "does it have street lights?".)
> >>     
> >
> > Test for street lights won't work, many small villages in Czech. Rep.
> > are signes as build-up area (with all the implied speed limits and
> > such), but they don't have street lights at all.
> >
> > Martin
> >   
> 
> street-lights as a mark of build-up areas works in UK and Australia and 
> maybe some other Commonwealth-Counties.
> 
> --
>  Mario
> 
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-- 
Radomir Cernoch
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Email, Jabber: radomir.cernoch at gmail.com