Levels of Transit

Taken from a window on Bart. What sticks out at me is the barbed wire that's keeping people inside the Bart station and the levels of highway. I know its meant to keep people safe, but its apropos in that if you look at the different levels of highway with Bart being on the bottom, its like the different levels of our economy. The upper class and middle class can easily move around while the lower classes are caged behind barbed wire - they can move only on a track back and forth.