Blue stop signs really exist! Here's where you'll find them, what they mean and what to do if you see one on the road.

So if you’ve ever spotted a pink traffic sign, you’re probably wondering when the heck that came into play. Unlike the elusive blue stop sign, pink traffic signs are more common than you think.

Here’s how they work and what are they used for: • Signal activation. The blue lights are wired into the traffic signal system and turn on when the traffic light changes to red.