On the one side, I agree that tagging should be more ellaborate.
On the other side, I just imagine few exceptions, and few categories
of vehicles. For instance, in France, when I write "psv", I mean
"buses, cabs, bicycles", because they are all allowed on the same
way, and everyone knows it. In fact, for the vast majority of ways,
everyone is allowed. So we may tolerate tricky tagging for tricky
events.
So we might start thinking about this once before quickly patching
current problems with tags like psv_directions :-)
I suppose when we have defined a new tagging reference, a small
script will be run on the database to modify automatically all ways,
and to raise flags if there is a need of manual intervention, which
should be rare. (such a script should be run to replace the value "1"
or "true" by "yes" when relevant, and so on...)
My point is to add information in the system in a structured way,
even if too complex. As the need of taging this "opposite bus lane"
is quite frequent where I live (Paris, France), I MUST find a
solution quickly. My current best approach is to create two ways, one
for cars one-way, and the other two-way for buses. It's stupid, and
splitting one way in two is a nonsense that will be hard to modify
back, so I really want to have it fixed!
Cheers,
----- Mail Original -----
De: "Ben Laenen" <[EMAIL PROTECTED]>
À: [email protected]
Cc: "Charlie Echo" <[EMAIL PROTECTED]>
Envoyé: Jeudi 26 Juin 2008 16:08:36 GMT +01:00 Amsterdam / Berlin /
Berne / Rome / Stockholm / Vienne Objet: Re: [OSM-talk] [tagging]
Feature Proposal - RFC - (PSV_directions)
On Thursday 26 June 2008, Charlie Echo wrote:
The proposal you mention is a radical change in the way we would
tag. We would move from tag=value to tag:subtag:subtag=value.
Sure, it's very different to current tagging, but we need to think
about more complex access restrictions.
The proposal isn't perfect either, one can't for example say that
goods vehicles over 3.5 tons are not allowed except for loading and
unloading (a restriction that appears a lot over here). The problem
in that restriction being that it depends on more than one property:
goods vehicles (buses are always allowed for example), maximum weight
3.5 tons, and an exception for loading and unloading its goods in the
area where the restriction applies.
Or what about restrictions applying one direction only, or
restrictions applying to only one lane in a three lane road?
The ordering problems you mention is another thing. I also can see
lots of ambiguity issues coming up.
Nevertheless, instead of adding new tags like psv_directions, and
after that probably moped_directions, bus_directions,
tram_directions, motorcycle_directions etc, we should think about a
much better tagging scheme for this. The proposal I mentioned is a
step towards something more powerful, but not quite there yet.
So we might start thinking about this once before quickly patching
current problems with tags like psv_directions :-)
Greetings
Ben
