<div>"Are you asking about a custom mapnik style sheet?"</div>
<div> </div>
<div>Yes</div>
<div> </div>
<div> </div>
<div>"Why are you using bridge_number=* instead of ref=* or bridge:ref=* ?"</div>
<div> </div>
<div>My understanding is that ref or bridge:ref would be the ref of the road over the bridge.</div>
<div>These are numbers relating specifically to the bridge structure itself and therefore</div>
<div>bridge_number would be of a similar nature to the proposed tag bridge_name.<br></div>