US Patent 10446025 Traffic light control system

A traffic light control system includes a first traffic light apparatus and multiple second traffic light apparatuses for displaying a direction pattern indicating intended movement of an emergency vehicle about to pass through an intersection, and a controller storing direction patterns each indicating a direction to take and a specific movement manner of the emergency vehicle. In response to a direction signal corresponding to one of the direction patterns, the controller controls the first traffic light apparatus to display the one direction pattern, and controls each of the second traffic light apparatuses to display a corresponding oriented version of said one direction pattern based on a location of the second traffic light apparatus.