[OSM-talk] Turn restrictions ambiguity

[Matt Amos]

On Thu, Apr 23, 2009 at 9:16 PM, David Earl <david at frankieandshadow.com> wrote:
> If one were to refer to nodes on the two ways instead of the way itself,
> it would remove the ambiguity wouldn't it? Albeit more complicated for
> the consumer to work out, in that it would have to decide which way the
> two nodes were on.

an alternative is to use the implicit direction of each way where
there is ambiguity, as is done for oneway. this would mean all
combinations can be uniquely resolved without way splitting or
explicit reference to nodes. it is also forward-compatible with the
existing scheme.

it would seem that the most user-friendly way of presenting this would
be built-in editor support*, e.g: by drawing an arrow from one way to
the other showing the disallowed route, rather than expecting users to
"parse" the relation themselves.

cheers,

matt

* i know, i know, "patches welcome", etc...