advice
alert
attention
background
border
caution
control
danger
direction
driving
enter
entry
forbidden
graphic
halt
hazard
highway
icon
illustration
in
information
instruction
isolated
law
legal
message
mutcd
object
octagon
official
police
red
restricted
road
roadsign
rule
safety
security
shape
sign
signal
single
stop
symbol
text
traffic
transportation
warning
white
woman