Look at either of the examples in the through_route proposal page. If you are driving from bottom to top, you approach a Y-junction where two roads diverge. Whether there is a give-way sign coming in the opposite direction is not sufficient to understand which branch of the Y is the "through route" as seen "from below" as it were - the "through route" may not be symmetrical. I don't have an example of this to hand, but it wouldn't be right to exclude this possibility.
And yes, there are junctions without a through route. In the USA you have four-way-stops whereby all roads see a stop sign. Sequencing is a bit informal - first-come-first-served in theory I believe, but that doesn't always work of course. Closer to home in continental Europe there are many junctions (away from main roads) which use "priority from the right" - i.e. all roads are deemed equal and no one road/route has priority over the others. These junctions are usually unmarked (i.e. no white lines and no signs) because they are deemed to be "default" in the absence of "priority road" signs (yellow diamonds). //colin On 2015-04-28 18:25, pmailkeey . wrote: > On 28 April 2015 at 16:25, Colin Smale <colin.sm...@xs4all.nl> wrote: > >> The "give way" sign won't help to distinguish between the arms where two >> roads diverge... > > You mean neither has give way markings ? Can you provide an example ? It's > sounding a bit like Russia ! > >> By the way, the sign is often a STOP sign, so the logic will have to check >> for both. > > Whether 'often' or not, that's true. That made me think of another > peculiarity - but it's not a stop, just a give way on the through route. So > yes, I've found a give way on the through route ! I guess this is a bit like > the mini roundabout scenario. Can we accept the concept of not having a > through route at a junction ? In the case I've found, there's no continuity - > different number,different name, give way but is a continuation of the main > route! > > -- > > Mike. > > @millomweb [2] - For all your info on Millom and South Copeland > via THE AREA'S PREMIER WEBSITE - > > CURRENTLY UNAVAILABLE DUE TO ONGOING HARASSMENT OF ME, MY FAMILY, PROPERTY & > PETS > > T&Cs [3] > > _______________________________________________ > talk mailing list > talk@openstreetmap.org > https://lists.openstreetmap.org/listinfo/talk [1] Links: ------ [1] https://lists.openstreetmap.org/listinfo/talk [2] https://sites.google.com/site/millomweb/index/introduction [3] https://sites.google.com/site/pmailkeey/e-mail
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