The yellow background it used to gain attention by catching the eye
The triangle and rectangle act as borders and highlight the key information
The picture and the word 'school' are used to reinforce each other and mean the same thing
The white background behind the word and image allow them to stand out
The sign uses very bright and bold colours that catch the eye this achieves its purpose of being a warning sign
Red can often stand for danger as as this is a warning sign the red triangle is warning people of a potential nearby hazard.
The sign has an assumed meaning and purpose the word 'school' alone does not infer a hazard however, it is a commonly used sign that we are all exposed to and therefore is a message we all understand to have a generic meaning.
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