Most road signs have use smybols to comunicate to some are to give orders others are to warn you. The use of colour on a road sign is very important to becasue that gives you an indication of whats infront. Also the use shapes of the signs tell you what to expenct for example this give way sign is a triangle because it is an order.
The use of colour of signs like these are to grap the attention and the bold font in the middle of the sign is recognisable and is not there to confuse.
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