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What You Didn’t Know About Road Signs

What You Didn't Know About Road Signs
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Rocks Falling Road Sign Next Mile

Street signs—They’re everywhere, and for good reason. They can regulate traffic, inform you of distant roads, such as intersections, or warn you about potential falling rocks that you can’t do much about. But did you know that everything about road signs—from their shapes and sizes to their images and colors—are used to convey more than what might seem obvious at first glance? Some may look bizarre and even nonsensical, but it seems that all road signs communicate more than you might think.

How Road Signs Affect Your Subconscious

Don't Even Think of Parking Here Sign Red Zone
One of the unique road signs found in NYC – Image Source (from Wikimedia Commons)

The Federal Highway Administration (FHWA) in the Department of Transportation has designed all traffic signs found in the Manual on Uniform Traffic Control Devices that all US states must follow. And, according to, this manual actually explains what these designs signify: the stop sign elicits fear by exuding power and complexity as a red octagon; triangular and diamond-shaped signs (like the yield sign) elicit caution by exhibiting instability or conflict; circular signs elicit comfort by representing stability and wholeness, and square-shaped signs elicit familiarity by symbolizing order and security.

If this sounds invented, according to, much research has gone into the designs of road signs with shapes, colors, symbols, and words so that drivers unconsciously react quickly and appropriately given the intended message of the sign. Dornbos Signs and Safety also backs up this claim, explaining this is also a big reason why the government standardizes road signs, with the intention to communicate with drivers while keeping their conscious focus on the road.

Why Some Road Signs Look Strange

Speed Limit 3 mph sign
Image Source (from Wikimedia Commons)

Except for these signs. Brandy Miceli of San Jose Mercury News noted that for this specific road, city officials wanted to grab the attention of drivers with signs like these to prevent them from driving around a blind curve at high speeds where accidents commonly happened. So, if it does grab your conscious attention, there is probably a good reason for it.

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But apart from colors and shapes communicating certain messages to drivers’ subconscious, the FWHA also organized signs as such. According to the FWHA’s website, colors like blue indicate roadside services, while brown indicates cultural or recreational sites, and yellow indicates a warning. They also note that signs use images to overcome language barriers and communicate messages faster.

Are Road Signs International?

Beware Unfenced Road For Next 150km Road Sign - Kangaroo, Emu, Camel
Image Source (from Wikimedia Commons)

As you can see, some of these strategies are used throughout the world. You don’t have to look for emus, camels, or kangaroos in the US, but I bet you know these signs.

While there is an international system known as the Vienna Convention on Road Signs and Signals, the US has not adopted it. Many of the symbols are the same. The colors and shapes generally differ except for the stop sign, yield sign, parking sign, and a few others. But we don’t have to worry about that. We just have to worry about the signs in front of us. Maybe the next time you drive you’ll be a little more aware of everything signs are communicating. And if not, I’m sure you’ll get the message anyway.

And please watch out for hitchhikers.

No Hitchhiking Road Sign
Image Source (from Wikimedia Commons)

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