Civil War Times Magazine - This detail from “A Manual of Signals” by Albert Myer shows his signal system of using flags, which became know as the "wig wag" system. Myer, using
Wigwag Meaning - YouTube
File:Halkirk level crossing wig-wags blown over (16966823931).jpg - Wikimedia Commons
Wig Wag Lights
Standard White Switch Label W/ Black Imprint - C-LABEL-WIG-WAG - Havis – MooringTech
Road Rules Awareness Week - Wig Wag lights | bus | Do you know what Wig Wag flashing lights are on buses and what you need to do when they are on? #