[Tagging] Tagging u-turn restriction with continuous painted line

Eckhart Wörner ewoerner at kde.org
Tue Jul 3 15:23:37 BST 2012

Hi Martin,

Am Dienstag, 3. Juli 2012, 14:56:21 schrieb Martin Koppenhoefer:
> +1, I guess it's the same everywhere. AFAIK there is no difference
> between a double solid line and a single one. You are not allowed to
> cross them (but you could if you didn't care about traffic rules, and
> you can if you are walking). This implies generally a legal
> restriction against overtaking, turning left and u-turns.

No, it doesn't.
* A divider does not imply overtaking restrictions, as has been argued before. In most (all?) countries, you are still allowed to overtake as long as you don't cross the divider.
* A divider does not prevent left-turns or u-turns. Reason: a divider is a linear feature, it is applied to ways, and implications on nodes (especially end nodes) are completely undefined. A closer look reveals that dividers at nodes are way more complicated, and we already have an answer to that: turn restrictions.

> well, whether something is sensible or not depends on a lot of
> parameters (e.g. the amount of other traffic). We have to tell the
> router that there is a solid line in the first place, something we
> currently mostly don't do (see taginfo,
> http://taginfo.openstreetmap.org/keys/divider has only 192 occurencies
> on ways).

No surprise since divider seems to be an abandonded feature.


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