[Tagging] Ways rendered on wrong layer (counter to the layer tag values)

[Simone Saviolo]

2010/8/20 Andrew Harvey <andrew.harvey4 at gmail.com>:
> I'm not sure when to use the bridge tag. In this part of the map
> http://c.tile.openstreetmap.org/17/120570/78686.png there is a footway
> which is at ground level at both ends, but significantly above the
> water below in the middle, held up by pylons. I tagged it with
> bridge=yes, layer=1. Then there is the motorway (in blue) which is
> above the footway bridge, it is tagged layer=2, but not as a bridge.
> But the renderer puts the layer=2 below the layer=1. I was assuming
> this is because the motorway has not been tagged with bridge=yes. How
> can I get the footway to render below the motorway? Or should I just
> tag that part of the motorway as bridge=yes too.
>
> Any help is appreciated.

If you tagged the footway as a bridge, it's because it is suspended
over the water (you said it's being held up by pylons). Is the
motorway suspended too? Then you should tag it as a bridge. If it's
not, then maybe the footway becomes a tunnel when it passes under the
motorway. This shouldn't be a problem of layers - unless I have
completely misunderstood the place you are describing. Do you have any
pictures?

Regards,

Simone