[Tagging] Slow vehicle turnouts

Dave Swarthout daveswarthout at gmail.com
Sat Aug 25 15:11:21 UTC 2018

Kevin wrote:
> lanes:forward=* and lanes:backward=* is the best that I've found so
>far to describe truck climbing lanes and similar features. They don't
>appear in your image to be grade-separated, so they don't need to be
>separate ways - one way for each section of the road, with appropriate
>lanes:forward and lanes:backward appears to describe what's on the ground.

That's what I had been doing previously and I know this would be "correct"
but it's so tedious to split and classify the highway lanes. I was looking
for a shorter, easier method.

Warin suggests passing_lane but I'm not wanting to start pushing
another new tag out there. Even that tagging scenario will require
additional tags (e.g., direction) to distinguish such a passing_lane from
the other lanes, or one would have to draw a separate "lane" the way I did
it in the example.

I noticed a comment in another thread about the old directive "don't map
for the renderer". The poster suggests that we must either map for the
renderer in cases where routing is concerned so that our work is useful
somewhere down the line, or else convince someone to provide routing
support. Does anyone know if any of the more popular applications consider
the "passing_place" or "passing_places" tags when determining routing?

Thanks for the responses,


On Sat, Aug 25, 2018 at 5:55 AM Warin <61sundowner at gmail.com> wrote:

> On 25/08/18 10:17, Dave Swarthout wrote:
> > I've been trying to decide tagging for slow-vehicle turnouts
> > consisting of a lane added to the right side (in the U.S.) of the road
> > so that slow moving vehicles can pull aside to allow following
> > vehicles to pass. The best I can come up with is the tag
> > highway=passing_place but strangely it applies only to nodes. I'm
> > looking for examples from the real world similar to the one in this
> > JOSM screenshot. I've selected both the passing lanes to color them
> > red so you can see them.
> >
> Passing place .. I know them from Scotland - on a single lane road (two
> way) if;
> you come up behind a slow moving vehicle they are supposed to pull in to
> the next 'passing place' and let you by,
> you see an oncoming vehicle you are supposed to pull into the next
> passing place .. unless the oncoming vehicle gets into one.
> Of course the actual road rules may be different from my observations ..
> but for a practical perspective that is the behaviour I have observed.
> Passing places have barely enough room for one vehicle towing a caravan.
> They are not that long. And you actually have to come to a complete stop
> in them .. too short to do anything else.
> I have followed a slow moving vehicle for some distance .. going by a
> few 'passing places' with no pulling over.
> And I have come across oncoming vehicles where I have pulled off the
> road risking getting bogged as there were no convent passing places
> available.
> > I had been using a variable number of lanes to describe the situation
> > but these two passing_places are offset making using the lanes tags
> > cumbersome to apply, 4 separate pieces, lanes going in different
> > directions, oneway sections, etc. According to the Wiki, the
> > passing_place tag is to be used only on nodes.
> > (https://wiki.openstreetmap.org/wiki/Tag:highway%3Dpassing_place) Why
> > this should be so, I do not understand.
> >
> > https://www.dropbox.com/s/p4g4t7mk6e4161l/passing_place.jpg?dl=0
> >
> > What alternatives do I have?
> Make a new tag.
> passing_lane?
> In some instances here the traffic is directed into the side lanes, with
> one centre land for passing...
> a danger here is with opposing traffic where opposing people want to pass.
> I take the chicken view - if there is opposing traffic that I cannot see
> around then I will not take that centre lane.
> This centre lane might also be termed a 'passing lane'.
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Dave Swarthout
Homer, Alaska
Chiang Mai, Thailand
Travel Blog at http://dswarthout.blogspot.com
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