Road Signs Guide: Shapes, Colors & Meanings
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Every U.S. road sign follows a national standard, so a sign's shape and color tell you what kind of message it carries before you can read it. Learn the system and you'll recognize nearly any sign at a glance.
The three types of road signs
- Regulatory signs tell you what the law requires: stop, yield, speed limits, turn restrictions, and parking rules. Ignoring them can get you a ticket.
- Warning signs alert you to hazards or changes ahead, such as curves, merging traffic, crossings, and slippery roads. Most are yellow diamonds.
- Guide signs help you find your way: route markers, exits, distances, services, and recreation areas.
Road sign shapes and what they mean
Shape is the fastest clue, and it works even when a sign is backlit, dirty, or seen from behind.
| Sign | Shape | Meaning |
|---|---|---|
| Octagon (8 sides) | Stop: used only for stop signs | |
| Triangle, point down | Yield: used only for yield signs | |
| Pentagon (5 sides) | School zone and school crossing | |
| Circle | Railroad crossing ahead | |
| Crossbuck (X) | Railroad crossing | |
| Diamond | Warning: possible hazard ahead | |
| Pennant | No passing zone | |
| Vertical rectangle | Regulatory: laws you must obey | |
| Horizontal rectangle | Guide: directions and information |
Road sign colors and what they mean
| Color | What it's used for |
|---|---|
| Red | Stop, yield, and prohibited actions (Do Not Enter, Wrong Way) |
| Yellow | General warnings about hazards or changing conditions ahead |
| Orange | Construction and work zones |
| Fluorescent yellow-green | School zones, pedestrian and bicycle crossings |
| White | Regulatory signs, such as speed limits and lane-use rules |
| Black | Regulatory signs such as One Way, and the lettering on white and yellow signs |
| Green | Directions, distances, and allowed movements |
| Blue | Motorist services: gas, food, lodging, hospitals |
| Brown | Parks, recreation, and cultural or historic sites |
| Fluorescent pink | Temporary traffic changes at crashes and other incidents |
| Purple | Lanes reserved for electronic toll-pass (E-ZPass-style) vehicles |
Road signs every driver must know
Want to know how these signs work at real intersections? See the right-of-way rules and our guide to traffic signals and lane markings.
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Play the rules of the road game →Frequently asked questions
What are the three main types of road signs?
Regulatory signs tell you what the law requires (stop, speed limit, no U-turn). Warning signs alert you to hazards ahead (curves, merges, crossings). Guide signs give directions, distances, services and points of interest.
What does a yellow-green (fluorescent) sign mean?
Fluorescent yellow-green is used for school zones, pedestrian crossings, and bicycle crossings. Slow down and watch for people on foot or on bikes.
What shape is a no passing zone sign?
A no passing zone sign is a yellow pennant (a sideways triangle) on the left side of the road. It marks where a no-passing zone begins.
Why do stop signs have a unique shape?
Stop signs are the only eight-sided (octagon) signs, so you can recognize one from behind, at night, or when it's covered in snow or dirt.