Styrofoam Used In Bridge Project

I always joke that I'm too poor to put insulation in my house, so I'm stuffing styrofoam cups inside my walls. Well it turns out someone actually IS using styrofoam for something. Apparently the attributes that make styrofoam undesirable-
a long lifespan, not biodegradable, and clogs landfills- also make it an appropriate material for a bridge project in southeast Idaho.

Here's the story from the Idaho Transportation Department's website.