a triangle
yes
I'm pretty positive Diamond shapes signs are warning signs.
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.
US standard traffic warning signs are yellow background with black symbols or letters. Traffic warning signs in other countries are generally white or yellow background with a red or black border in a triangular shape. Industrial warning signs are various colors, including OSHA and ANZI standards with orange background and black lettering. A yellow OSHA or ANZI sign would mean "caution" not "warning".
It depends on the merge sign. Some merge signs, for example, have ROUNDED corners. These would NOT be a regular polygon because a regular polygon has straight angles and vertexes. However, other kinds of merge signs have STRAIGHT angles and corners, like a rotated square. Therefore, these merge signs WOULD be regular polygons.
WHAT icons? If you are referring to the SHAPE of the signs themselves, the shape of the sign itself signifies the type of information the sign conveys. (e.g.: Octagaonal signs are ALWAYS stop signs - Diamond-shape signs ALWAYS convey some type of warning message - etc).
Warning signs are typically yellow with black lettering or symbols to indicate caution. However, some warning signs can be white, especially in specific contexts, such as regulatory signs that convey mandatory actions or information. It's important to recognize the color and shape of each sign to understand its meaning. Overall, yellow is the most common color for warning signs on the road.
Warning signs for traffic are usually diamond-shaped (i.e., rhombus), or a square oriented with one corner pointed down. Warning signs for other purposes may be square, rectangular, round or other shapes as may be required by local standards.
there are no warning signs
Green signs are not warning signs. They are signs that tell you it is "safe" to do something.
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