ASL zone is a space where our language is used only in visual-spatial modality in some places such as schools for the Deaf, ASL classrooms and ASL instructors' offices, Gallaudet University campus, and Deaf gatherings where using voice is considered disrespectful. It's a norm in Deaf culture.
Image created by Jolanta Lapiak at handspeak.com.
Hearing people who do know sign language are expected to use the signed language with other signers, whether hearing or Deaf. If a hearing person doesn't know any signed language, helping the hearing person by using vocal communication is understandable in some contexts.
A street zone sign can be seen at many Deaf schools, classrooms, offices, Deaf clubs, and such.
Some schools for the Deaf have a street sign notice on a wall to remind.
Photo by the KSD, June 2013.
This street sign at the Kentucky School for the Deaf is really nice to push the unwritten rule into a formal notice.
And one more funny thing.
On a few separate occasions, a few users emailed me, explaining about their trouble or struggle with the videos that sound didn't work properly on this handspeak website, even though they never had any problem on any other websites. I replied to them that this website is an ASL zone, which means no sound on virtually all videos on this website. They replied back with a sheepish laugh. ¯\_(ツ)_/¯