access
alert
attention
ban
caution
circle
clipart
danger
design
do not
forbidden
graphic
icon
illegal
illustration
indication
information
isolated
law
no
no entry
not
notice
parking
pictogram
prevent
prohibited
prohibition
prohibitory
regulation
restrict
restricted
restriction
restrictive
risk
road
round
rule
safety
sign
standard
stop
street
symbol
traffic
transport
transportation
warning
zone