Any military airbases feature plenty of ground crew using hand gestures and colorful wands to communicate with pilots. Here's ...

Unless it's at night, in which case hand signals ... like a traffic stop or accident — something that's best to slow down for, regardless. The two primary ways to signal police activity is ...

which found that the company's First Responder Program "meets industry standards," including the ability to respond to hand signals for traffic cops. In early 2019, Waymo first demonstrated its ...