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A sign signifying the actual border line between the United States and Mexico is shown on the Cross Border Xpress enclosed pedestrian bridge on June 8, 2017. Cross Border Xpress (CBX) is an enclosed pedestrian skywalk bridge that spans the U.S./Mexico border, connecting a passenger building in San Diego to the Tijuana International Airport (TIJ) terminal immediately south of the border. It opened on December 2015. (Photo by Bénédicte Desrus)