[Talk-us] Marking of turn:lanes in the cases of an implied right turn

[Tod Fitch]

When tagging turn lanes I was taking my cue from the actual painted markings on the pavement. For your example where the right lane can go either straight or turn right but there are no markings, I've been tagging as left|||

I haven't used "none" as the examples I took for my guide did not use that and the turn lane plug-in for JOSM id not complain. but looking at the wiki it seems I ought to go back and fix those to be like left|none|none|none

For routing and guidance I think that turn restriction relations are probably easier to program for on the consumer side. But given how many issues there are with relations in other areas for many mappers I suspect that more intersections will be code with turn:lanes that with relations.

But if all you did was use the information to indicate on the top bar which lane one want to be in on upcoming turns then it might be easier to use turn:lanes information.

I look forward to having OsmAnd support this, so thank you very much!

-Tod



On Jun 24, 2014, at 6:28 PM, Saikrishna Arcot wrote:

> Hi all,
>  
> I'm working on adding turn:lanes to roads at traffic lights, and am also working on adding support for reading turn:lanes in OsmAnd (Android). I'm wondering on how to mark turn:lanes in the case of an implied right turn. For example, let's say that you're approaching a traffic light and there are four lanes heading in your direction. The left-most (1st) lane is indicated as a left-only lane. The second, third, and fourth lanes are unmarked (therefore, it would be none for these lanes). This would mean that the second and third lanes are straight-only, and the fourth lane is straight and right (let's assume a right-turn is allowed here).
>  
> In this scenario, would this be marked as left|none|none|none or left|none|none|through;right, and if it's the former, would data consumers have to infer from the turn restrictions and see that a right turn is allowed there?
>  
> -- 
> Saikrishna Arcot
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