[Talk-us] Check your turn:lanes

Jack Burke burkejf3 at gmail.com
Thu Aug 25 17:09:44 UTC 2016

So I take it that at least you and I are in agreement that the wiki is
deficient for branching exits like this one:  http://mapillary.com/map/im/

Your Osmand "invention" example is a perfect case-study of what I'm working
on.  I'm trying to get exits on I 75 in Georgia and Florida tagged with
destination and lane guidance so that Osmand can show proper guidance, and
hopefully other OSM-based navigation apps will add that feature, too.  As
it stands, I use Osmand to test my tags.

On Thu, Aug 25, 2016 at 12:55 PM, Paul Johnson <baloo at ursamundi.org> wrote:

> On Thu, Aug 25, 2016 at 11:04 AM, Jack Burke <burkejf3 at gmail.com> wrote:
>> Even if the road isn't signed that way?  The use of "through" when there
>> is no explicit marking to that effect seems to be contraindicated by the
>> wiki.
> I'm considering the ground truth in this case to be how the lane can
> actually be legally used, since (at least in North America where the
> direction of travel is obviated by the yellow centerline) lane arrows are
> much less common than in some other parts in the world.  Otherwise most
> intersections with turn pockets would end up as none|none|none|none instead
> of left|through|through|right.  Low-angle intersections are especially
> tricky for routing engines; in absense of anything other than a lane count,
> for example, Osmand will "invent" a new lane for the departing ramp
> (indicating say, the right most of through|through|through) instead of the
> correct through|through;slight_right (with the slight_right highlighted).
>> Don't get me wrong--I don't see why we _couldn't_ use it when that is the
>> obvious traffic direction, even with the lack of explicit signage.  But if
>> that's how we want to use "through" then shouldn't we update the wiki to be
>> more clear?
> I think the wiki should be updated, yes, since the wiki's not describing
> how it's been implemented in the real world right now.  Though, to be fair,
> the only consumer I know that's actually doing anything with this data
> right now is Osmand.
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