Question

why the colour of school buses are yellow

Answer 1

School bus yellow is a color that was specifically formulated for use on school buses in North America in 1939. The color is now officially known in Canada and the U.S. as National School Bus Glossy Yellow and was originally called National School Bus Chrome. The pigment used for this color was, for a long time, the lead-containing chrome 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.

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Answer 2

The yellow colour of a school bus isn't just for looks . In India, all school buses are painted yellow, as this is mandatory by law.
This is also for greater safety. In fact, yellow is the most visible colour to the eye. Also, because of its somewhat 'illuminating' nature, the colour yellow is relatively more visible in dim light.
Apart from all this, scientists claim that we are 1.24 times more likely to spot a yellow object, even when we're not looking straight at it.