Airport lights. Airport wig - wag lights before the runway. | CanStock
wigwag - Wiktionary, the free dictionary
Wigwag Flashing Lights - Negative Input/Positive Output - Isolate Left and Right Lights Relay Wiring Diagram
South Orient Wig-Wag: South of Coleman, TX Located about 4 miles south of Coleman, Texas, this wig-wag … | Railroad lights, Old train station, Railroad photography