Road sign shapes and colors: what each one means
U.S. road signs follow a national standard (the MUTCD), so their shape and color tell you what they mean even before you can read them. An octagon means stop, a downward-pointing triangle means yield, a diamond is a warning, a pentagon marks a school zone, and a round sign warns of a railroad crossing ahead. For colors: red = stop or prohibited, yellow = general warning, orange = work zone, green = directions, blue = motorist services and brown = recreation.
Signs by shape
Permit tests often show a sign with the words removed and ask what it means.
| Shape | Meaning | Example |
|---|---|---|
| Octagon | Come to a complete stop | STOP |
| Downward triangle | Yield | YIELD |
| Circle | Railroad crossing ahead | Yellow circle with X and RR |
| Crossbuck (X) | Railroad crossing | White RAILROAD CROSSING |
| Pentagon | School zone or school crossing | Children walking |
| Diamond | Warning about the road ahead | Curve, slippery when wet |
| Pennant (sideways triangle) | Start of a no-passing zone | NO PASSING ZONE, on the left side of the road |
| Vertical rectangle | Regulatory: a rule you must follow | Speed limit, no left turn |
| Horizontal rectangle | Guide or information | Directions, distances, exits |
Signs by color
| Color | Meaning | Example |
|---|---|---|
| Red | Stop, yield or prohibited | STOP, YIELD, DO NOT ENTER, WRONG WAY |
| White | Regulatory | Speed limit, ONE WAY (black and white) |
| Yellow | General warning | Curve, merge, signal ahead |
| Fluorescent yellow-green | Pedestrian, bicycle and school warnings | School crossing |
| Orange | Work zone | ROAD WORK AHEAD |
| Green | Directions and distances | Highway exits, city names |
| Blue | Motorist services | Gas, hospital, rest area |
| Brown | Recreation and cultural sites | Parks, campgrounds |
Signs people mix up
DO NOT ENTER and WRONG WAY are both red. DO NOT ENTER means you may not drive into that road from your direction; WRONG WAY means you've already entered against traffic. If you see it, get out of the way safely right away.
When you see orange work zone signs, slow down and follow workers and flaggers. Many states raise fines for violations in work zones.
The round yellow railroad sign comes before the crossing; the white crossbuck is at the crossing itself. When you see either, look and listen for trains and be ready to stop.
Learn signs with Permitly
Permitly draws 44 U.S. road signs in the app, grouped into regulatory, warning, work zone and guide signs. Every sign question shows the sign itself, and a 20-question signs-only test lets you look at a sign and pick what it means.
This guide covers rules shared by most U.S. states and is for study only. Permitly is not affiliated with any DMV or government agency, and details can differ by state, so always check your state's official driver handbook.
Learn all 44 signs by sight
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