According to this nearly 20-year-old New York Times article, the reason is that white tops are more reflective, lowering the temperature inside the bus by an average of 10 degrees during the summer.?
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Ten years ago, the Transport for London introduced a programme for the installation of white panels atop the capital's trademark red buses in the framework of further climate-adaptation plans. More specifically, white panels reflect the rays of the summer sun, thus keeping the vehicles cooler.
Buses (and large trucks) are designed to carry a lot of weight on their axles, which effectively means that they need to have very stiff springs in their suspension. This makes for a very bouncy, harsh, uncomfortable ride, which can be fatiguing for a driver who has to deal with it all day long.
School bus yellow is a color that was specifically formulated for use on school buses in North America in 1939. Originally officially named National School Bus Chrome, the color is now officially known in Canada and the U.S. as National School Bus Glossy Yellow.
School Bus & Mini Bus - Most alarm systems in a school bus or a mini bus will have a single “reset button” that is installed. The reset button is usually located above the back row of seats so the driver walks to the back of the bus (and checks for children) to reset the alarm.
Even when you are looking ahead, you can see yellow in your peripheral vision. Scientists say that lateral peripheral vision for detecting the color yellow is 1.24 greater than that of the color red. So, yellow school buses are not for aesthetics, but mostly for safety and to make sure we can see them.
1. Easy Entry for Passengers. A front engine has the center of the bus mostly occupied, but there is no block with a rear engine. This allows for an easier flow of traffic for passengers.
In 1907 one company, the powers that be at London General Omnibus Company had a genius idea. They decided to paint the entire fleet red, making their buses stand out from their rivals, and place numbers on the front of the bus to tell people the route it would be taking.