What is one common indicator of a gang-affiliated neighborhood?

Graffiti is a common indicator of gang affiliation in a neighborhood as it often serves as a form of communication for gangs. It can signify territorial boundaries, convey messages to rival groups, or even memorialize fallen gang members. In many instances, the types of graffiti observed can indicate the specific gang that operates in that area, as different gangs have unique symbols and tagging styles.

While the other options may contribute to a neighborhood's overall character, they do not specifically indicate gang activity. Street lights, public parks, and community centers are features that can exist in both gang-affiliated and non-affiliated neighborhoods. The presence of graffiti, however, is closely analyzed by law enforcement and community members to identify and respond to gang-related issues.