The Stop Sign Wasn’t Always Red.Yellow signs were used before there was a way produce a reflective material in red that would last.
We have the Mississippi Valley Association of State Highway Departments to thank for the stop sign’s iconic shape. In 1923, the association developed an influential set of recommendations about street-sign shapes whose impact is still felt today. The recommendations were based on a simple, albeit not exactly intuitive, idea: the more sides a sign has, the higher the danger level it invokes. [more inside]
posted by Obscure Reference
on Dec 13, 2011 -