alert
ban
bar
black
brick
car
caution
circle
concept
danger
deny
direction
do
enter
entrance
entry
forbid
forbidden
graphic
highway
icon
information
metal
negative
no
not
object
prohibit
prohibited
prohibition
restrict
restriction
road
roadsign
round
rule
safety
shape
sign
simple
stop
street
symbol
traffic
transport
transportation
warning
way
white