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What does a big circle with nothing in it mean for traffic signs?

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## Related Questions

###### Asked in Rules of the Road

### Color of a warning sign?

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".

###### Asked in Math and Arithmetic, Algebra, Geometry

### What is the diameter of a circle that is equal to pi?

If you mean the diameter of a circle with area pi, then the
diameter is 2.
If you mean the diameter of a circle with circumference pi, then
the diameter is 2.
If you mean the diameter of a circle with diameter pi, then the
diameter is pi.
If you mean the diameter of a circle with radius pi, then the
diameter is 2pi.