School buses are not just yellow, they are “school bus yellow”. In 1939, the color was formulated especially for school buses in North America. However, not only the color was the topic of discussion; altogether 44 different standards were defined. From height to lengths, from aisle width to lighting – teachers would be proud of the accuracy and that all of the rules are documented and followed as Federal Standards.
Some countries around the world have adopted the color to quickly attract attention, but the school bus yellow is far from being usual everywhere. I have searched the internet and couldn’t find any explanation why buses like this one can be found in Middle East but still it was parked shining brightly in front of the Kingdom Tower in Riyadh (Saudi Arabia).