Hope and Happiness, the Nature and Culture of Yellow:
Yellow is sunshine. It is a warm color that, like red, has conflicting symbolism. On the one hand it denotes happiness and joy but on the other hand yellow is the color of cowardice and deceit.Yellow is one of the warm colors. Because of the high visibility of bright yellow, it is often used for hazard signs and some emergency vehicles. Yellow is cheerful.For years yellow ribbons were worn as a sign of hope as women waited from their men to come marching home from war. Today, they are still used to welcome home loved ones. Its use for hazard signs creates an association between yellow and danger, although not quite as dangerous as red.
Information from http://desktoppub.about.com/cs/colorselection
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