I previously worked at a company that made the light-controlled switches that control individual street lights. We shipped a lot of them, so I assume they are common. They are visiable and you can often spot them. They look like a plastic bulb on top of the light fixture.

At one point we came out with a slim line (low profile) design. When I asked why, they said that good ol' boys in Texas were riding in pickups and shooting the switches as a game. The low profile model was a harder target to hit. :-)