The reference given below, will help you to know more about your question.
really school buses are orange and yellow
Yellow became the colour for school buses in 1939, so till then and for a while after 1939 it is conceivable that buses were a different colour than yellow.
I think school buses are yellow because not many cars are yellow so they will stand out more. School buses are painted chrome yellow for its high visibility Also because the federal safety people say it has to be. So technically yellow school buses are a federal law
Visibility and distinction. It's a highly visible colour, and it's distinct in that it is the colour associated with school buses.
to tell them apart from public transport.
Not all buses are yellow but most school buses are yellow.
School buses are painted yellow for safety and visibility. The color yellow is highly visible in various weather conditions, making it easier for drivers to spot buses on the road. Additionally, the use of yellow helps distinguish school buses from other vehicles, signaling that children are likely nearby. This standardized color helps ensure the safety of students during their commute.
School buses are painted in a variety of shades of yellow or orange. But the official color in the US is called National School Bus Glossy Yellow (CMY 1, 12, 100). It is a mixture of cadmium yellow and cadmium orange, and was renamed from National School Bus Chrome, a paint that contained chrome yellowpigment (lead II chromate).
There is no set colour for school buses in Europe. Europe has about 50 countries and they have lots of school buses of all sorts of colours.
Yellow with black.
It is a federal law.
Yellow.