abstract
access
admission
alert
allowed
attention
background
ban
caution
circle
danger
do
emblem
enter
entrance
entry
forbid
forbidden
hand
hazard
icon
illustration
isolated
label
law
no
not
please
prevent
prohibited
prohibition
red
regulation
restricted
restriction
road
round
rule
safety
sign
sticker
stop
symbol
touch
traffic
transportation
urban
warning
white