On Tue, Dec 15, 2009 at 6:52 AM, Richard Mann <span dir="ltr"><<a href="mailto:richard.mann.westoxford@googlemail.com">richard.mann.westoxford@googlemail.com</a>></span> wrote:<br><div class="gmail_quote"><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div>bridge=yes is so that people can render nice parapets</div>
<div> </div>
<div>I'd agree that layer tags should not be required for water/highway crossings. Keepright should keepquiet!<br></div></blockquote><div><br>Although nothing is "required" in OSM, the layer tag always helps on a bridge because you could have multiple bridges passing each other (as in a highway interchange). In that case, the layer tag specifies at what "layer" in the 3rd dimension the bridge exists.<br>
<br>See for example <a href="http://osm.org/go/ZVMvmEVc">http://osm.org/go/ZVMvmEVc</a><br></div></div>