PV Gap

Lauren Said:

What powers signs on the side of the highway?

We Answered:

Hi Tyler! Yes, most are solar powered with a sheetload of batteries also inside. The batteries run the sign at night.
However, here and in places like the Pacific Northwest where we only see the sun for a few hours a year many of them are actually powered by small engines running on gasoline or propane. And yes, there are dudes that go around and keep them topped off, you just won't see them often because they usually do it at night when traffic is less dangerous.
Fortunately, these engines are very fuel efficient and don't need much fuel.