Regarding above-mentioned Downtown L.A Harbor Freeway ramps: big part of opening credit sequence of 1957 movie "No Down Payment" is filmed on those ramps.
I wasn't able to figure out what is the area the movie's two couples lives. The film has a quite realistic view towards life, at least for the major Hollywood studio production.
http://tinyurl.com/nbobcjq
If the film was already discussed here, I'm terribly sorry.