Where I have been mapping admin boundaries I put them all in as layer=1 - this 
brings them above most things in the mapnik rendering.
See: http://www.openstreetmap.org/?lat=51.60655&lon=-0.05558&zoom=15&layers=B0FT
 
Cheers
STEVE

        -----Original Message----- 
        From: [EMAIL PROTECTED] on behalf of Adrian Frith 
        Sent: Sun 2/10/2008 7:06 PM 
        To: [EMAIL PROTECTED] 
        Cc: 
        Subject: [OSM-talk] administrative boundaries that run along roads - in 
the Mapnik layer
        
        

        Hi All,
        
        In Cape Town we've been mapping the suburb boundaries (which are
        official) as boundary=administrative admin_level=10. These boundaries
        run often down the middle of roads, railways or rivers. They show up
        very nicely on the Osmarender/[EMAIL PROTECTED] layer as dashed red 
lines - see for
        example
        http://www.openstreetmap.org/?lat=-33.95&lon=18.45&zoom=12&layers=0BFT
        
        On the Mapnik layer, however, they show up only where they do *not* run
        along roads or railways - it seems that the other features are rendered
        on top of the boundaries. Should we not be rendering administrative
        boundaries above real features?
        
        My understanding is that this would require a change to the z_order code
        in osm2pgsql. Is that correct?
        
        Regards,
        Adrian
        
        
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