President Donald Trump called California’s high-speed rail project “the worst managed project I think I’ve ever seen.” ...

The earliest tunnels in Southern California were built for shelter, or mining purposes, but as civilization encroached, the region’s mountainous terrain required tunnels for railroads, aqueducts, and ...

Tunnels may not be glamorous, but there are few things more satisfying than honking your car’s horn when driving in a tunnel bored through a mountain. The urge to test the acoustics of a car ...