Visual signals like pictures, posters, photographs etc economies on verbal communication. What cannot be said in so many words can be easily conveyed in visual terms.
Colorful paintings, photographs, posters etc make communication interesting and motivate the receiver of the message.
They are also a reflection of the mental makeup, intelligence level; cultural background of the communicator.
Posters, paintings, illustrations etc have an educational value. Wherever the workers are illiterate, posters etc. go a long way to educate them, and give them instructions in the various operations of machines adopting safety measures, maintaining cleanliness and so on.
Posters are a very effective means of advertising. They immediately attract the attention of the public/potential buyers.
Sound signals are very quick in conveying the intended message. For example, the ringing of a bell or the shooting of a siren makes the workers active, both in reporting for duty, winding up the day’s work, or to take safety measures.
Sound signals are very useful in time management. One can always plan one’s day on the basis of time signals.
Use of buzzers and such other devices streamlines the working of the organization by regulating visiting hours, giving adequate waiting time to visitors and breathing time to the managers.
Sign language, whether using visual signs or audio/sound signals can communicate only elementary and simple ideas. Any complications or skews in ideas can hardly be conveyed through posters/pictures.
It is not at all easy to draw effective pictures or posters. It requires great skill on the part of the artist to be able to get the exact idea.
Sign language can be effective in combination with verbal communication.
Sign language is quite likely to be misunderstood. The receiver of the message has to be in a proper frame of mind to decode the message/ information conveyed be visual or sound signals.
While in verbal communication spot correction is very easy, it is not so in sign language. It is generally not easy to repeat, retract or improve upon these signs/signals.