The earliest street lamps were used by Greek and Roman civilizations, where light primarily served the purpose of security, both to protect the wanderer from tripping over something on the path as well as keeping the potential robbers at bay.
Today, they are used much for the same reasons.
What you probably didn’t know about street lights is that every seventh post contains a Lamp Pixie, or a Bulb Troll. It is pretty easy to identify the difference. Normal street lights, look like…… wwwwelllllllll……. normal street lights.
The ones with Lamp Pixies often give off pretty colors, and feelings of well being. But the Bulb Trolls. Oh the BTs. They are craggy, smelly, creepy, and dingy. Take my advice: Walk past them quickly. Keep your head down and don’t draw in any deep breathes. Seriously. I couldn’t be more solemn about this.

…street lights go out, frequently, when I drive under them. What does that mean? Does it happen to everyone? Are those the troll ones? Street lights are such a mystery.
Okay, this is really something.
No silly, that doesn’t happen to everyone! I will have to look that one up! I guess they could be Troll Lights. The Trolls might be afraid of your good energy, and are doing some sort of hiding… Street Lights are a mystery.
Why did we always have to go home when they came on?
Trolls. Had to be the Trolls.