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]
Crayola As the size of Crayola crayon packs increased from the original 1903 crayon packs, the variety of colors available has also increasedâ€”reaching 120 colors by 1998. Since 1998, new colors have been added, but always replacing existing colors. In all, 50 colors have been retired, bringing the total number of regular colors produced to 170. On March 31, 2017, Crayola announced that Dandelion would be retired. On September 14, 2017, the replacement color "Bluetiful" was announced.[33] The colour is reportedly a new hue realized after experiments done at Oregon State University. It was discovered while scientists were experimenting with electronics.[34]