access
advice
alert
attention
avoid
border
caution
closed
control
dangerous
direction
enter
entrance
entry
error
finger
grid
info
information
issue
label
law
locked
message
no
notice
power
prevent
private
prohibited
property
protect
protection
regulation
risk
rule
safety
security
signboard
site
station
steel
stop
traffic
transportation
warn
warning
way
work
wrong