Sign Shapes and Colors
Sign shapes and colors are a shorthand system: you can often identify a sign's purpose before you can read it. The exam tests this mapping directly, so learn the pairs cold.
Core rules
- Octagon, red: STOP.
- Inverted triangle, red and white: YIELD.
- Diamond, yellow: warning.
- Pennant, yellow: no-passing zone ahead.
- Round, yellow: railroad advance warning.
- Pentagon, fluorescent yellow-green: school zone or school crossing.
- Crossbuck, white X: railroad crossing.
- Vertical rectangle, white: regulatory.
- Horizontal rectangle, green: guide; blue: services; brown: recreation.
- Orange diamond: construction or work zone.
Worked example
You see a red octagon at an intersection. Even before you read STOP, the shape and color identify it as a stop sign, so the required action is a complete stop at the line, crosswalk, or intersection edge. If the same message appeared on a yellow diamond, it would be a warning, not a command - the shape and color change the legal meaning. That is why the exam asks you to identify both, not just read the word.
Traps
Do not treat every yellow sign as a warning about construction; orange is the work-zone color. Do not confuse the round railroad advance sign with a regulatory speed sign. The pentagon is school, not the diamond. A white rectangle can be regulatory or guide, so read the legend. Color alone is not enough when shape and legend conflict with your first guess.