Hi, 
out of curiosity, how are those residential areas defined? Is that coming from a database?

It's because I noticed that sometimes you draw them around one block, but other time you include several blocks including the residential roads.
https://www.openstreetmap.org/way/1326132933#map=17/41.666860/-72.762756

And sometimes you include all houses in that block but sometimes you exlude several. Like in case of Day/East Street intersection.
https://www.openstreetmap.org/way/1326132932

cheers