There are actually people who collect traffic lights, too.

I have one I bought from my municipality; my intent is to use it in a classroom as a behavior modification system. I bought a controller board for it and probably will swap the incandescent bulbs for LEDs.

When I did some research on it, I found people who have 20+ lights (practically whole intersections). Some of these guys are also into road signs.

Then there's the guy who collects Texas Instruments calculators. I found the page when I was looking up a calculator I was planning to use with a student.

Personally, I collect Pittsburgh Pirates bobbleheads. I usually only display the guys currently on the team; the rest are in my closet. (As I type this, I'm being watched by Joel Hanrahan, Andrew McCutchen, Neil Walker, and Nate McLouth). I also collect coins (which is a family hobby; I'm a fourth-generation collector) and baseball cards (third-generation collector).