[Talk-us] access=private on driveways

[Adam Franco]

On Tue, Jul 14, 2020 at 7:46 AM Greg Troxel <gdt at lexort.com> wrote:

> ...
>
> As for access=private 'breaking' routing, this discussion feels very
> much like tagging for the router, instead of tagging what is and fixing
> the router.  If you are driving someplace and you have permission, then
> it should be expected that you can use access=private ways to get to
> your destination.  Humans konw this, and while most people wouldn't
> randomly drive down other people's driveways, it's obvious that if you
> are invited to a house it's ok to use their driveway.
>
> So a router that does not allow use of access=private for a final
> segment, by default, is broken.
>

There is a big problem with this interpretation of tagging ways with
access=private that are not posted/gated to prevent access but are not used
by convention/norm: Doing this makes it impossible to distinguish these
from roads that *are* gated/posted.

As an example, a local airport has gated service roads and driveways
<https://www.openstreetmap.org/way/310385892#map=17/44.46348/-73.14431> to
get to a variety of maintenance and airline buildings. These are
appropriately access=private because they are gated and only employees can
use them. Routers need to be able to direct customers/public via the
close-by access=public/destination/customers roads and not try to use the
access=private roads. If access=private is used for most residential
driveways and routers need to treat access=private as a thing to be ignored
for final routing, they will get this airport situation wrong.
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