[dave5104]

> And then you have idiots that build train tracks and highways right through lava

I was disappointed to see no active lava flows in your linked image. What you show is simply a road and train tracks built on top of rocks.

[dheera]

Lava will likely flow there again the next time Shasta erupts.

[renewiltord]

True, but we were dumb enough to build a civilization on this planet and lava will flow everywhere the next time we have something like what caused the K-T event so I suppose it runs in the family.

[dave5104]

Its eruption history is on the order of once every hundreds of years. By the time its next eruption comes around, it's very possible that infrastructure will be long gone for other reasons.

In most cases, infrastructure existence and placement is barely a blip on geologic time.