NCDOT-DMV-SIGN-COLORS.txt

+nc  Which background color is used for signs

A white background indicates a regulatory sign;
yellow conveys a general warning message;
green shows permitted traffic movements or directional guidance;
fluorescent yellow/green indicates pedestrian crossings and school zones;
orange is used for warning and guidance in roadway work zones;
coral is used for incident 

https://mutcd.fhwa.dot.gov/services/publications/fhwaop02084/index.htm


What color are most warning signs on the road?
yellow
Warning signs are yellow with black lettering or symbols and most are diamond-shaped. These signs warn you to slow down and be prepared to stop if necessary; a special situation or hazard is ahead. Some common warning signs are shown below. IOWA
https://iowadot.gov/mvd/driverslicense/dlmanual/section2.pdf

STANDARD COLORS

RED
Stop, yield, or do what is
shown on the sign.

GREEN
Direction. Indicates where
a place is, or how far a
place is from where you
are.

BLUE
Services for travelers.
Directs you to places such
as rest areas, tourist sites,
hospitals, lodging, fuel
stations, restaurants, and
tourist attractions.

YELLOW
General warning.

FLUORESCENT
YELLOW-GREEN
Pedestrian, bicycle, and
school warning signs.

WHITE
Regulatory. Provides
information regarding
enforceable laws and
ordinances.

ORANGE - ROAD WORK
Road work, temporary
traffic control, and
maintenance warnings. Be
sure to watch for changing
speed limits and workers
on the road.

BROWN
Recreation and cultural
points of interest. Provides
direction to historical sites,
parks, or recreational areas.

FLUORESCENT PINK
Warning and guide signs
for incident management
such as crash clean up,
debris removal, etc.

===
 The three-sided pennant shape is used for which road signs? 
    NO PASSING ZONE

The shape of a do not enter sign is: 
   square WITH red CIRCLE and WHITE LETTERS

PEDESTRIAN CROSSING AHEAD
   Yellow DIAMOND shape, showing person walking between 2 lines

STATE ROUTE SIGN
   rectangular, black numbers on white diamond background on black background

A pentagon-shaped sign means:
A. School zone


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