Thanks to your comments - and a bit of home work - I solved the street 
problem exposed in the thread above. I kept the single trace test for 
each house but just added a test for those houses bordering the streets 
and adjusting their height to the local street level.

The image below shows the result, with Paolo's (Philippe's) ground 
texture added too.

The code for the urbanism is posted in p.b.s-f of course (version 
2013.03.29)

Thomas

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