It would appear that the rendering for a bridge might include the parapet.  
Much of my local mapping however includes barriers along roads.  These are 
generally connected to the bridge parapet.  It would seem reasonable to 
therefore have a seperate way for each bridge paparet that links the barriers 
either side of the bridge.  Perhaps, barrier=wall, wall=parapet.   Parapet is 
however  used in more that one context http://en.wikipedia.org/wiki/Parapet   
If bridge parapets were to be mapped would they therefore need a more distinct 
name in this context "bridge_parapet" of should there be some sort of relation 
between the highway segment of the bridge and its associated parapets?  

At the moment I just leave the barriers "hanging" but it doesn't seem like a 
very satisfactory approach to mapping given they are attached to the bridge.

Regards

Dudley


                                          
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