You've probably heard that 1 in every 5 miles of US Interstate highway must be straight so planes can land…

You've probably heard that 1 in every 5 miles of US Interstate highway must be straight so planes can land in emergencies. It sounds official — but it's a complete myth. No such law has ever existed in the US, and the Federal Highway Administration has debunked it many times. The Interstate system was designed for cars and freight, not fighter jets. Did you believe this one too?