I've just noticed if you have a bridge going over a trunk dual carriageway the 
oneway arrows render above the bridge, 

e.g.
http://www.openstreetmap.org/?lat=51.872301&lon=0.316664&zoom=18

And if you zoom out a bit the arrow on the opposite carriageway overlays the 
bridge rather than the one shown here.

I've checked the tagging and the bridge over is at layer 1 and the trunk road 
has no layer tag. 

I guess this isn't an easy thing to resolve. Go to decimal layers and have the 
arrows at +0.5 layer or whatever?

Just thought I'd mention it in case it isn't known about.

Ed



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