A claim about Arizona’s highways landed in front of me the way these things usually do, dressed up with numbers that sound too specific to be wrong.
Millions of tons of scrap tires, tens of millions of tires recycled, a decibel reading that supposedly dropped overnight on one stretch of Phoenix freeway. Some of that checks out. Some of it, once I went digging through Arizona’s own numbers and the federal reports behind them, does not.
What follows is the version that actually holds up: how a city, not the state, got there first, why 1988 is the year that mattered, what is genuinely in the mix under your tires, and the real noise number, which turns out to be a better story than the rounder one making the rounds. I also kept circling back to why a program like this only holds together when nobody has to finish it all at once, and that thought shows up again at the end.
It started as a way to solve a tire problem
Scrap tires are a genuinely annoying waste product. They do not compress well in a landfill, they trap air and rainwater, and stockpiled tires have a bad habit of catching fire and burning for a very long time once they do, which is roughly the opposite of what a landfill is supposed to do. States spent decades looking for something useful to do with the ones piling up…