Thanks Anthony, that worked. For some reason lambdas still confuse me, I 
need to work on that.

In terms of the model I didn't show all the fields, there are mid block 
addresses as well. I am thinking the best way forward is to denormalize the 
road table into the address table and put the values directly in there. 
This part of the database is very static so I could keep the road table as 
a lookup for building new intersection and mid block address table entries 
with a custom form. In the rare event a road changes name an update query 
could take care of that. That would remove the recursive database lookup. 
This is an inventory of city infrastructure - traffic signals, pedestrian 
signals at mid block, radios etc. It is currently managed by spreadsheet 
which has its own set of little horrors such as several ways to represent 
76 Avenue spawned by people typing things in. I have a lat long value pair 
to the address table and adding some code would weed out duplicate entries 
and coordinate lookup failures would prevent entry of impossible addresses. 
It might be time to look at the GIS extensions to PostgreSQL if this 
prototype gets wings.

Thanks much for your help,
Ron

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