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

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 ...

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 ...