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Because scientifically it has been proven that to the human eye, black on a yellow surface is easier to see than any other color combination. Caution signs are obviously meant to be noticed and therefore they are often yellow with black writing or pictograms.

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Q: Why are caution signs yellow?
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What is the noun form of cautious?

caution like on those yellow signs


A flashing yellow light at an intersection?

The flashing yellow lights means proceed with caution.


Are school zones indicated by regulatory signs with posted hours of operations and flashing yellow lights advising caution?

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Warning signs are usually what shaped?

Warning signs are usually a diamond shape. The color of the sign is yellow in order to caution drivers about an intersection ahead, bicyclists or wildlife that may be near the road.


A flashing yellow signal means?

means nothing Wrong! It means caution. Something requires extra attention. At an intersection, a flashing circular yellow means to take extra caution, and watch for traffic on the cross road (which has a flashing red light). A flashing red light is the same as a stop sign. A flashing yellow arrow means you ma turn in the direction of the arrow, but you must yield to conflicting traffic. If the flashing yellow light is not at an intersection, it either calls attention to a road hazard on an accompanying sign, or indicates that a special regulation indicated on the sign is in effect (School speed limit 20 when flashing).


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Where can one locate pictures of caution signs?

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