[OSM-talk] Dual carriageways

[Etienne]

I hope the next version of Map Features that Andy is working on will have a
more structured approach to this problem.

There should be a base level of tags that describe simple atomic attributes,
like oneway=yes, lanes=3, car=yes, bicycle=no and then additional higher
level tags that are short-cut definitions of a group of atomic tags.  So
highway=fr:motorway would be explicitly and formally defined (in an xml
document) as being equivalent to surface=tarmac, lanes=3, hardshoulder=yes,
bicycle=no, car=yes, speedlimit=120km, speedlimit:rain=100km, etc.

If someone makes a transformer that converts highway=motorway into its
constituent parts then routing software can just look for oneway=yes and
doesn't need to know how the French administration have arbitrarily defined
a motorway.

Etienne

On 10/19/06, raphael Jacquot <sxpert at sxpert.org> wrote:
>
> Etienne wrote:
> > Bruce
> > You shouldn't need to tag motorways as oneway because that is implied
> for a
> > motorway.
> >
> > For other roads; trunk, primary, etc, you do need to tag each
> carriageway
> > with oneway=yes otherwise there is no way to tell.
> >
> > FWIW there is no need to tag roundabouts as oneway either.  That is an
> > implied attribute of junction=roundabout.
> >
> > Etienne
>
> imho, they should be. special casing in the routing algorithm is a
> stupid idea
>
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