[Tagging] Turn lanes separated by road markings

[Paul Johnson]

On Fri, Sep 6, 2019 at 2:14 PM Markus <selfishseahorse at gmail.com> wrote:

> Hello everyone
>
> I'm unsure how to map the following situation:
>
> There are two lanes approaching a roundabout, both with different
> destinations. The lanes are divided by a solid line (and later a panted
> triangle with chevrons) for about 100 m before they are separated
> physically:
>
> https://www.openstreetmap.org/way/430073056
>
> Do we have a relation for storing the information that the left lane
> continues on [way 394112487](https://www.openstreetmap.org/way/394112487)
> and the right lane on [way 290130794](
> https://www.openstreetmap.org/way/290130794)? This information is
> important in order that routers don't announce too late (i.e. when the
> lanes can't be changed anymore) which lane one has to take.
>
> Or is turn:lanes + change:lanes enough? (And what if there were no turn
> lane markings?)
>

Consider putting the split at the theoretical gore and making the right
turn sliproad placement=transition from the theoretical gore to the
bullnose.  Example: https://www.openstreetmap.org/way/397356496
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