Vibrating traffic signal controller?

Thread Starter


Joined Oct 29, 2009
A few weeks ago I was off on one of my bicycle tours. This one went through a small town in NW Pennsylvania. A really quaint little town called Franklin, PA.

I had stopped in town for the night at a nice B&B and went off exploring.

They seemed to have a fairly modern traffic control signal system with the new LED lighting.

I walked by on control box and it was vibrating like crazy. I sounded like it was about to shake right off of the poll.

With a modern system what could be vibrating? I would expect few if any relays in a newer system so what could be causing all of that shaing?