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Each Signal Intersection is designated by its main signal use including Traffic Signal, School Flasher, PedFlasher, Traffic Flasher, Parking Ban, Speed Monitor, or Lane Use. Each Signal Intersection has a unique ID and is linked to the unique ID of the main Control Box of the intersection. Additional data on attributes of Signal Intersections, such as Location, is included. Intersections were largely digitized based on the older GIS layer sde.PORTGIS.Traffic_Lights originally digitized by Michelle Sweeney in 2006 and updated byh Thea Youngs in 2016, in conjunction with Nasir Shir, and Kevin Thomas using staff knowledge and 2006 orthoimagery. These were updated by Briana Fischella in the summer of 2018 to current status with a combination of Streetscan imagery, 2015 orthoimagery, and field verification for older imagery and newer infrastructure not captured in most recent imagery. 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