Funny enough your amazing scripts work on NURB curves but for some reason give errors on simple ellipse 
but that is never used anyway IRL…
I was wondering whether it would be possible to keep some information about which curve degree would be filleted with which other so there could be a similar hierarchy to hose fillets.
Say I want the major-major, major-medium, and major-small would have x units of fillet for high-speed turns, the middle-middle, and middle-small would have y units of fillet, while small-small would have z units fillet.
I just sat down to the computer so I don’t have any progress myself yet. Will post if I get something.
EDIT. For now I resolved to classic attractors script but on larger geometries it might not be the best option and also in some cases the fillet point is closer to the small roads (extreme angles) so its not 100%.