RJM,
It seems that you are asking about automation of "crossing signals" for a location where a street crosses one or more tracks. Is that correct?
So far as I am aware, JMRI does not have any specific support for this. There are something like a bazillion ways to implement such a thing, so JMRI cannot easily implement a "one-size-fits-all" solution.
(Since you seem to be working on a LocoNet-based solution, I will contact you "off-list" about possible solutions.)
Regards,
Billybob
