Yellow is the color of sunshine, hope, and happiness. Yellow also represents freshness, happiness, positivity, clarity, energy, optimism, enlightenment, remembrance, intellect, honor, loyalty, and joy.
Studies show that the color yellow promotes the feeling of warmth, cheerfulness, increased mental activity, increased muscle energy. The color yellow helps activate memory, encourage communication, enhance vision, build confidence, and stimulate the nervous system.
Bright yellow is an attention grabbing color, and when used in contrast with black, is creates one of the easiest color combinations to read and see from a distance. This is why school buses, taxi cabs, and traffic signs are painted yellow and black.