[Tagging] Traffic sign relevant direction: relation type:enforcement vs. direction=* vs. traffic_signals:direction=*

[Kevin Kenny]

On Mon, Mar 27, 2017 at 10:34 AM, Marc Gemis <marc.gemis at gmail.com> wrote:

> On Mon, Mar 27, 2017 at 4:21 PM, Kevin Kenny
> <kevin.b.kenny+osm at gmail.com> wrote:
> > I'm having a hard time picturing any case where this couldn't work.
>
> In the case you have added e.g. a stop sign on the way. A second
> mapper comes in, splits the way on the stop sign, reverts the
> direction of one of the spit parts. Now the node is at the end of 2
> ways with different direction and one cannot know what is
> forward/backward in that node. But any good editor can give a
> warning/error for such a case.
>

Exactly. JOSM and Meerkartor surely have more sophisticated checks than
that already. In fact, finding that case is an easier check than anything
involving the 'nearest intersection' rule, which could be broken any time
that someone adds, say, a driveway close to the intersection. That's a lot
harder for an editor to check for. Enumerating nodes along a reversed way
and checking that you haven't changed the direction of a traffic control is
trivial by comparison.
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