Sign Colors, Shapes, and Symbols
What this domain tests
Color and shape let you recognize a sign's purpose before you read the words. The exam tests standard color meanings, distinctive shapes, and common symbols, including signs whose legend is obscured.
Core rules
- Red: stop, yield, prohibition, or danger. White: regulatory information. Black: regulatory or message text. Yellow: warning. Orange: temporary work-zone warning. Green: guide and destination information. Blue: motorist services. Brown: recreation and cultural guidance. Fluorescent yellow-green: school, pedestrian, or bicycle warning.
- Shapes: octagon = stop; inverted triangle = yield; diamond = warning; pentagon = school; round = railroad advance warning; crossbuck = railroad crossing; rectangle = regulatory or guide depending on color.
- Symbols: a red circle with a slash means prohibited; a left arrow with a slash means no left turn; a pedestrian symbol warns of crossings; a train symbol warns of railroad activity.
Worked example
A sign shows a black left-turn arrow inside a red circle with a red diagonal slash. Even without reading text, the symbol means no left turn. If the same arrow appeared on a white rectangle without the red prohibition symbol, it would be a lane-use or turn instruction, not a prohibition.
Traps that cost marks
- Confusing yellow warning signs with orange work-zone signs.
- Treating green guide signs as regulatory commands.
- Missing the red slash that turns an arrow into a prohibition.
- Forgetting that shape can identify a sign when the legend is damaged or covered.
- Assuming all rectangles have the same meaning regardless of color.