Federal Highway Administration

How a fluorescent vest and thirty years of standards cut highway worker deaths — and why smartphones are reversing the gains.

A highway looks simple, but it's a precision-layered structure engineered to last 30 years under millions of truck loads.

Road markings are optical devices engineered to survive 10,000 trucks a day. Here's how they actually work.

The five D’s of walkability — density, diversity, design, destination accessibility, and distance to transit — explained.