[Tagging] Bridges and layers

[Simone Saviolo]

2010/7/28 Richard Mann <richard.mann.westoxford at googlemail.com>:
> On Wed, Jul 28, 2010 at 10:27 AM, James Livingston
> <lists at sunsetutopia.com> wrote:
>> Someone mentioned http://wiki.openstreetmap.org/wiki/Relations/Proposed/Bridges_and_Tunnels up-thread, is there anything it doesn't cover? I've been using it for over a year, although I haven't mapped any really crazy scenarios.
>
> You'd probably be better off using parapet:right=no, and hoping the
> renderers figure out how to draw offset lines (Maperitive does offset
> lines already, and there's a draft routine for doing them in Mapnik).
>
> That's far more likely than they'll pre-process a relation consisting
> of near-parallel lines.

The relation's scope goes beyond parallel dual-carriage ways. Suppose
there's a parking on top of the bridge, or any other type of building,
amenity, service... You'd include it in the relation, thus indicating
it's on the bridge. There's no way to do it without the realtion.

> Richard

Simone