What once was the site of car crashes, pedestrian threats, and drive-by shootings in Southeast Portland’s Mt. Scott-Arleta neighborhood is now a rainbow-striped community space. The new extended Arleta Triangle, a public plaza located in the former right-turn lane that allowed cars to bypass the light at SE 72nd Avenue and SE Woodstock Boulevard, officially opened to the public Thursday with a celebratory block party. The Arleta Triangle, formerly a small traffic island with trees.