Going on a walk around my neighborhood with an awareness for sensors, I noticed more obvious sensors where there were less people. For example, on Bedford Avenue, where there were lots of people during my walk, I mostly noticed card swipe sensors, buttons, light sensitive street lights, and those loud door beep sensors in stores. When I went toward the water to Kent Ave, where there are mostly large warehouses, a park, and fast traffic, there were all sorts of truck beeps and back up sensors, this thing:

and a lot of these:

So even at night when there is nobody in sight you can feel watched and metered.
I ended my sensor walk swiping my way into the subway:

[wpvideo 9TrJloev]