But while it’s rare, you might come across a blue stop sign, either on a United States roadway or abroad. What does a blue stop sign mean, and where might you see one? Are they used for purposes ...

This comes one week after the I-TEAM showed you the signs calling ... About half the blue boxes are gone from the last time we told you about what the US Postal Service was doing with the mail.

But you might be surprised to learn that for the 30 years prior, yellow stop signs were prevalent. Weird to think about in retrospect, right? But even more of an oddity is the elusive blue stop sign.