The main signs are categorized into four meaning types:

Guidance (white characters on blue in general – on green in expressways), Warning (black characters and symbols on yellow diamond), Regulation (red or blue circle, depending on prohibition or regulation),

One may also ask, what are the 8 basic shapes of signs? What are the meanings of the eight shapes of signs: octagon, triangle, vertical rectangle, pentagon, round, pennant, diamond, horizontal rectangle? Octagon -> Stop. Triangle -> Yield. Vertical Rectangle -> Regulatory.

Also, whats an example of a guide sign?

Guide signs provide directional and mileage information to specific destinations. They can be rectangular or have other shapes. Route signs mark federal interstates, state highways, and county or municipal roadways. The interstate system uses a shield symbol that is blue on the bottom and has a red band across the top.

What color sign and letters usually tell you what not to do?

Warning Signs These signs are yellow with black lettering or symbols and most are diamond-shaped. These signs warn you to slow down and be prepared to stop if necessary; a special situation or hazard is ahead.