The Autopian on MSN

The loud popping sounds you hear from some semi-trucks slowing down actually happen for a practical reason

Millions of semi-tractors hit the road every single year to keep America running with everything from the mail and Amazon ...
Sidetrack Adventures on MSN

30 men built this mountain road by hand in 1861

Long before Interstate 15 and even before Route 66, travelers heading into Southern California had only one option through the rugged Cajon Pass. A narrow wagon road carved into the mountains in 1861.