One thing we say a lot here is that we're always learning something new, especially when it comes to the history of the sign industry. Today we spotted this great video on Yahoo News and were surprised to learn a few more things we didn't already know about traffic signs.

Most of us here knew that yield signs used to be yellow, but it was quite a surprise to several members of our team to learn that stop signs used to yellow, too! What bit of sign history did you find most interesting?