School crossing guards, Vernon Williams and Sevrina Leeth, want to make E. Pima Street and N. Country Club Road the "friendliest corner" in Tucson. Williams, a veteran, says he suffered from post traumatic stress disorder, PTSD, and waving to drivers and giving air hugs helps with his recovery. Williams and Leeth work outside of Blenman Elementary School. Video by: Mamta Popat, Arizona Daily Star