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red
stop or prohibition. If you see a red on a traffic device. STOP
green
directional guidance and permitted movement
yellow
general warning
blue
motorist services guidance
black
regulation
white
regulation
orange
contraction or maintenance warning
horizontal rectangles
usually for guide signs
octagon
exclusively for stop signs
equilateral triangle
exclusively for yield signs
pennant
warning of no passing zone ahead
diamond
exclusively to warn of existing or possible hazards on or adjacent to roadway
vertical rectangle
usually used for regulatory signs
pentagon
school crossing zones and warning of school zones ahead
round
warning of railroad crossing ahead
Solid red light
must make a complete stop and remain stopped until the light turns green
solid yellow light
slow down and prepare to stop
sold green light
go if safe to
yellow flashing arrow
yield to oncoming traffic; may turn if you are in the proper lane
flashing red light
must stop completely and proceed with caution
flashing yellow light
slow down and exercise caution