attention
background
black
car
caution
circle
communication
danger
distress
do
flat
forbidden
grunge
horn
icon
illustration
label
loud
message
no
noise
not
pattern
pictogram
prohibited
prohibition
quiet
red
road
round
rubber
scattered
seal
sign
signal
silence
sound
stamp
stop
symbol
textured
traffic
trumpet
use
volume
warning
watermark
white
zone