Sign Shapes and Colors
Sign Shapes and Colors give quick meaning before you read the words. This domain tests whether you can identify the standard shape-color combinations and use them to classify a sign correctly, especially when the legend is unfamiliar or partly obscured.
Core rules and concepts
- Octagon: stop. It is the only standard octagonal sign.
- Inverted triangle: yield. It is the only standard inverted triangle.
- Pennant: no-passing zone.
- Diamond: warning, usually yellow with black symbols.
- Rectangle: regulatory signs are usually white with black or red legends; guide signs are green, blue, or brown.
- Circle: railroad advance warning, yellow with black RXR.
- Crossbuck: railroad crossing, white X with black letters.
- Red means stop, yield, or prohibition; yellow means warning; orange means construction; green means guide; blue means services; brown means recreation; white means regulation; fluorescent yellow-green marks school and pedestrian warnings.
Worked example
A sign is a red circle with a diagonal slash over a left-turn arrow. The shape is a circle and the color is red, but the slash supplies the prohibition meaning: no left turn. If the same message appeared on a white rectangle with a red circle and slash, it would still be regulatory. If it appeared on a yellow diamond, it would be a warning about a turn, not a command.
Traps
Do not rely on color alone; red appears on stop, yield, and prohibition signs. Do not confuse a yellow warning diamond with an orange work-zone diamond. Do not read a pennant as a yield sign. Do not assume a green rectangle is a regulation simply because it is rectangular.