If you could choose only two things as a staple of any war movie, they'd probably be military jargon (like "roger" in military aviation) and hand signals. Whether it's Easy Company deep behind enemy ...

Turn signals are one of the earliest automotive safety features. In the early 1900s, some cars came with mechanical arm "trafficators" that would pop out of either side of the car to indicate a turn.

A not-insignificant part of driving a vehicle of any kind, no matter how many wheels it has, is knowing the necessary methods for signaling intent — lane changes, warnings to other drivers, that sort ...