What is this? It flashes every time an ambulance speeds by. They are all over my city
It’s a traffic control system designed to give emergency vehicles the green light — literally. That device is called an Opticom™, made by Global Traffic Technologies (GTT). Here’s how it works: Emergency vehicles are equipped with an emitter, which sends out a visible or infrared strobe signal. Traffic intersections have an Opticom receiver, mounted near … Read more