Lu Hefa (2005) defines public signs as "open and facing the public, with signs, instructions, prompts, displays, warnings, signs <br>, and textual and graphical information related to their lives, production, life, ecology, and life.
Lu hefa (2005) defines the public as "open and face the public, notices, instructions, prompts, displays, warnings, markings and their lives,<br>Text and graphic information related to production, life, ecology and industry
LV Hefa (2005) defined public signs as "public and facing the public, notice, instruction, prompt, display, warning, sign and their life<br>Text and graphic information related to production, life, ecology and Industry<br>