Luckily these condiments are color coded, so I don't think anyone is going to have an issue here unless they are color blind. We often forget about the color blind people of the world. They need to be considered as well. The traffic light system works really well for them because they are at different heights, but imagine if it was all one light that changed. Color blind people would be getting in wrecks all the time.
I used to clean these machines when I worked at a movie theater. Out of everything to do there - clean the theater, take out the trash, cook hotdogs - cleaning the mustard and ketchup dispensers was the worst. The mustard and ketchup vapors would burn your skin and make you itch for hours. There's something about mustard that is deadly. No wonder there's such a thing as mustard gas. Just add hot water and it becomes a deadly weapon.