abstain
access
addiction
alert
allowed
attention
background
ban
blank
caution
circle
cross
danger
design
forbid
forbidden
graphic
hazard
icon
illegal
illustration
indication
information
isolated
law
line
mark
no
not
notice
prevent
prohibited
prohibition
red
restrict
restriction
restrictive
risk
road
rule
safety
sign
stop
symbol
template
traffic
transportation
warning
white