abstract
access
admission
attention
background
ban
beware
brick
caution
circle
closed
closeup
control
crisis
danger
design
direction
enter
entry
executive
finish
forbidden
indication
journey
law
no
no entry
object
pole
prohibition
red
restriction
road
road sign
roadsign
round
rule
safety
security
sign
signboard
stop
street
symbol
traffic
transportation
travel
urban
view
warning