On Sun, May 24, 2020 at 10:50:19PM +0200, Colin Smale wrote: > On 2020-05-24 20:47, Florian Lohoff wrote: > > > - The "Ground truth" we tag restrictions only when visibly assigned and > > verifyable. > > It is sufficient to say "verifiable". It does not always need to be > evidenced by a visible sign - as long as another independent mapper > could (easily) verify its truth. The fact that (in many countries) speed > limits and parking rules change when you enter a settlement means that > these attributes are verifiable without there needing to be an explicit > sign.
But these are basically "legal rules" you may find somewhere. I am fine
with that. I am not fine with guesswork.
"I think the owner allows bicycles but not cars"
without any hint of this really beeing the case. You'll open up
a huge can of worms if suddenly access tags are not reliable but
some Jo mappers guesswork.
> > So - people try to overload the meaning of access=private
> > with something more like ownership=private.
>
> Access=private always means you have no "right" of access, and must keep
> out unless you have permission from the appropriate authority (be that
> the owner of a driveway or the operator of a nuclear power station).
> That permission can be explicit (a permit or invitation) or implicit
> (delivery drivers etc). Routers frequently apply different rules for the
> first and last segments of a route, blocking routing over "private"
> roads in the body of the route but not hesitating to use them if they
> are the only way to access the start and destination locations.
I had the phrasing in our German discussion already. In routing
you are either
Allowed to use a way
Not allowed to use the way
Allowed to use the way at the tail/head of a route
What is access=private? And if you answer "it depends" - On what
does it depend and how does the software know? And how does the
software distinguish between ways in a nuclear power plant and
a driveway?
access=private is mostly excluded for everything for good reasons.
For a driveway marking it as service/driveway is everything you need.
It has penaltys so its basically the same as destination. If you add
a private to a driveway you change the routing availability
from destination to no.
And i dont think this is what most owners of a driveway would expect.
If they dont want people on their driveway by all means the'll put up
signs or barriers which is common in some areas of the world.
I definitly would be angry if some random mapper adds a access=private
to my 1.5km driveway (Which i have) because i want people to be able
to reach my house. I had this and it caused 15km+ diverts for people
relying on OSM.
Flo
--
Florian Lohoff f...@zz.de
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