Sign Colors and Shapes
Sign Colors and Shapes
Sign color and shape give you a message before you read a word. The exam tests the standard system, so learn the pairings rather than memorizing individual signs.
Core rules
- Red means stop, yield, or prohibited; white with black is regulatory; yellow warns; orange marks construction and maintenance; green guides; blue marks services; brown marks recreation and cultural sites.
- Fluorescent yellow-green marks school, pedestrian, and bicycle warnings.
- Purple is used on some toll facilities for electronic toll collection.
- Shapes: octagon = STOP; inverted triangle = YIELD; diamond = warning; pentagon = school; round = railroad advance warning; crossbuck = railroad crossing; vertical rectangle = regulatory; horizontal rectangle = guide.
- A pennant (triangle pointing right) marks a no-passing zone.
- Color and shape work together: a yellow diamond is a warning, while an orange diamond is a work-zone warning.
Worked example
You see a black-on-yellow diamond showing a curve arrow, and later a black-on-orange diamond showing a worker symbol. The first is a permanent warning of a curve; the second is a temporary work-zone warning. Same shape, different color, different meaning. If the exam asks which sign warns of a condition that may not be present tomorrow, the orange one is the answer.
Traps
Do not rely on color alone; a white sign can be regulatory, and a green sign can be a guide. Do not confuse the round railroad advance sign with a regulatory circle, and do not assume every yellow sign is a work zone - yellow is permanent warning, orange is temporary.