York Elementary School in Raleigh was on a brief "code yellow" lockdown on Thursday afternoon after students saw a person in the woods near the school, the principal told parents in an email. The ...

Virginia Polytechnic Institute and State University, popularly known as Virginia Tech, holds a yellow light speech code rating, according to the Foundation for Individual Rights in Education’s campus ...

The Cooper Colour Code was a system invented in the 1980s by a former US Marine to classify awareness to danger. Today, Jeff Cooper’s Code is taught to the military, police and private security forces ...

In part three (Lockdown Voices: Big-data Glitches, Yellow Health-codes, and “Spatial-temporal Companions”), we turn our attention to the ways in which the ubiquitous red, yellow and green phone-app ...