[Tagging] Carriageway divider

Philip Barnes phil at trigpoint.me.uk
Sun Aug 19 17:43:46 BST 2012

On Sun, 2012-08-19 at 11:44 +0200, Fabrizio Carrai wrote:
> After a short discussion on the italian talk, I would move the
> discussion in this list. After some tests  with OSRM, I missed the
> availability of a tag to mark the continuos (or discontinued) line
> that divide the lanes in several single carriageway.
> In my opinion this is an important indication to the routers to avoid
> illegal turns across a road. A typical useful application case is a
> road with many side road [2]. Actually the problem is solved with
> several turn restriction relations, one for each side way. Tagging the
> main way with "divider=solid_line" the problem would have been solved
> in a easier way, also reflecting the real status of the road.
> Indeed a "Divider=solid_line" proposal [3] was already presented . I'm
> would revamp such proposal.
> What is your opinion ? Is there any router developer here ?
How would you tag the direction of the solid line? An example here

Traffic approaching the bend is not allowed to cross the line, traffic
leaving the bend is. Through the bend there are double white lines,
indicating neither direction may cross.

I have never seen a turn restriction, enforced by a solid line however.
There will always be a turn restriction sign.

It is far simpler to just use the turn restriction where needed, there
are very few of them. Whereas nearly every corner will need
that will rapidly become tedious for mappers.


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