The official name for these ominous road snakes is just “pneumatic road tube."
Storyboard
What Are Those Weird Black Tubes All Over The Road?
We've been thinking about tubes. Specifically, the weird black tubes that you often find stretched across a roadway. What are those tubes for? What are they tracking? How do they work?
Photo: thepremierdaily.com
Mystery Tubes: What Do You Do?
