In an attempt to avoid this kind of "false tagging for rendering" I have a 
submitted an addition to the mapnik style tonight.
It will render highway=construction or highway=proposed from z12 upwards.
It will also render a text label (based on name=) for z13 upwards.
Jamie's more sophisticated suggestions make sense but are not easily to render 
at the moment. Perhaps we can work towards that time-based approach later.
For now it would make a lot of sense for people to revisit roads under 
construction they have tagged and follow this suggested scheme:
highway=construction
construction=foo (motorway, trunk, primary or whatever - if known)
name=Foo bypass, due to open Dec 08 (or whatever)
 
PS: I haven't looked at the file but hope this doesn't throw osmarender rules 
out, which I know picks something up to render construction
 
Cheers
STEVE

        -----Original Message----- 
        From: [EMAIL PROTECTED] on behalf of Dave Stubbs 
        Sent: Mon 3/31/2008 6:03 PM 
        To: Peter Miller 
        Cc: Talk Openstreetmap 
        Subject: Re: [OSM-talk] Mapping Mottram and Tintwistle proposed bypass
        
        

        On Fri, Mar 28, 2008 at 10:08 PM, Peter Miller
        <[EMAIL PROTECTED]> wrote:
        >
        >  Thanks for that Robert. A few other questions:
        >
        >  1) How does one tag something that is being considered seriously 
(such as
        >  the Mottram Tintwistle bypass), but which may well never get built? 
I think
        >  I will just put the estimated build date given by the highways 
agency for
        >  now. (I will also continue to use the tunnel trick to get it to 
render in
        >  the mean time).
        
        
        By "tunnel trick" I presume that you mean tag it as a tunnel so that
        it turns up dotted, despite not being a tunnel, nor ever will be a
        tunnel?
        
        That's not a trick, that's a dirty, dirty hack and should be stomped on 
hard.
        
        If you want proposed roads to show up dotted then fix the renderer,
        don't engage in phantom tagging.
        
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