why the colour of school buses is yellow
School bus yellow The color was chosen because it attracts attention and is noticed quickly in peripheral vision, faster than any other color. Scientists describe this as follows: "Lateral peripheral vision for detecting yellows is 1.24 times greater than for red."[2]
Softball In 2004, high-visibility yellow "optic" covering, long-used for restricted flight balls in co-ed recreational leagues, became standard for competitive play. Yellow is the color of official NCAA and NAIA softballs. Yellow softballs are fast becoming the standard for all levels of play for girls' and women's play in particular. White balls are also allowed, but are very uncommon in slow pitch and fastpitch.