The other day I was driving behind a bus and it had a sign on the back that read "This vehicle does not turn on red" and the word "red" was colored red while the other text was black. Is there an actual purpose to this?
At first I thought that maybe it's to aid someone that is unfamiliar with what color the word "red" represents, but then I started thinking about what the sign is actually for. I would assume that the target audience for that sign is other drivers; presumably so that they would exercise extra caution. How likely is it that someone that is licensed to drive would be able comprehend that sentence and understand the implications of it, but then not know what color "red" is?