allowed
anti
attention
background
ban
caution
circle
concept
danger
design
enter
entry
forbid
forbidden
graphic
icon
illegal
illustration
indication
information
isolated
law
line
mark
no
not
object
prohibit
prohibited
prohibition
red
restrict
restriction
restrictive
risk
road
round
rule
safety
sign
single
stop
street
symbol
traffic
transportation
warning
white
wrong