According to the website China Pictures, there is not one uniform color that applies to all buses in China. The Chinese have double deck buses and "normal" buses. Looking around at pictures, it is clear that buses in China come in all color varieties and often have multiple colors. Some are all white, others yellow or green but most have at least two colors and some type of advertisement or text on them.
Visibility and distinction. It's a highly visible colour, and it's distinct in that it is the colour associated with school buses.
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.
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.
china
cars, buses, and bikes.
the least transportation use in china is buses or ships
buses and subways
cars, buses, and bikes.
China Anne McClain's favourite colour is purple.
Usually London buses are red. Although I think you know the answer because you stated it in the question.
to tell them apart from public transport.
China has about 90 million students who need to ride school buses, requiring over one million buses to serve them. However, it only has slightly over 10,000 buses that meet legal safety requirements for school buses. While China does manufacture safe school buses on a commercial scale, virtually all of them are exported to other countries.