[Talk-ca] Telenav mapping turn restrictions

James james2432 at gmail.com
Mon Apr 3 17:29:28 UTC 2017


I've made it easier for everyone I sent an email to the local police
station about the legalities of turning right at the light vs taking the
ramp/turning lane. Hopefully they will answer me.

On Mon, Apr 3, 2017 at 1:18 PM, Martijn van Exel <m at rtijn.org> wrote:

> James -- I could not find any OSC / Mapillary imagery at the location of
> your example so I took a peek at <<AHEM>> google street view. What I see
> there is that the slip road / ramp was (as of Aug 2016 -- temporarily?)
> closed to traffic which may very well inform the allowed right turn at the
> intersection? Or do you know this to be permanent? In this particular case,
> based on the info I have, the _link way should have access=no and indeed no
> restriction would be necessary. (Obviously I can't make those edits because
> of <<ahem>> above.)
>
> I'm not saying that there cannot be exceptions to the general rule that
> 'when there is a turn ramp one must use it', (and as I said before our team
> is not adding these 'implicit' restrictions until we clear this up). What I
> am looking for is more clarity (specifically in Canada but in the US also)
> as to traffic regulations that would make adding these restrictions not
> only valid but also a boost to the quality of OSM data. I would only want
> us to add these if there is no confusion regarding correctness and there is
> added value to adding them.
>
> I'm cc-ing the US list as there are very similar traffic situations there
> and I'm interested in clarifying the situation there as well.
>
> Martijn
>
>
> On Apr 3, 2017, at 6:47 AM, James Mast <rickmastfan67 at hotmail.com> wrote:
>
> Martijn, with your example you gave back 3/30 [1], are you 100% sure that
> it still might be legal to right turn at the main intersection?  It might
> be if you haven't been there, even with the slip lane being there.
>
> Case in point, if you were to have one of your mappers modify this
> intersection [2] with a 'no right turn' relation, you would be adding false
> information to the OSM database.  While there is a 'slip' lane for right
> turns, there is overhead signage past that slip lane leaving US-19 saying
> that you are allowed to make a right hand turn at the intersection.  So,
> [3] would be completely legal and would be prevented if a false relation
> were to be added here.
>
> This is just something you can't be 100% sure of without visiting it in
> person, or have imagery from something like Mapillary to see it.  So, I can
> see why Andrew was upset about this.
>
> -James
>
> [1] https://www.openstreetmap.org/directions?engine=osrm_
> car&route=40.66610,-111.86760;40.66386,-111.86464#map=18/40.
> 66520/-111.86552
> [2] https://www.openstreetmap.org/directions?engine=osrm_
> car&route=40.58570%2C-80.04423%3B40.58680%2C-80.04410#
> map=19/40.58625/-80.04431
> [3] https://www.openstreetmap.org/directions?engine=osrm_
> car&route=40.58614%2C-80.04461%3B40.58680%2C-80.04410#
> map=19/40.58648/-80.04457
>
> ------------------------------
> *From:* Stewart C. Russell <scruss at gmail.com>
> *Sent:* Friday, March 31, 2017 7:26:12 PM
> *To:* talk-ca at openstreetmap.org
> *Subject:* Re: [Talk-ca] Telenav mapping turn restrictions
>
> On 2017-03-31 04:29 PM, Martijn van Exel wrote:
> > … the engine
> > may decide, lacking an explicit restriction, to take the non _link turn
> > because it's faster even if that is an illegal turn. That is why we need
> > these restrictions to be explicit in the data.
>
> but … but — that's Tagging For The Map, or worse, Tagging To Fix
> Software Stupidity. It's explicitly mapping something that's *not*
> there, and so is contrary to what we're supposed to map.
>
> I don't have a problem with it being in Telenav's data, but it doesn't
> belong in OSM.
>
>  Stewart
>
>
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-- 
外に遊びに行こう!
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