access
addiction
alert
allowed
attention
banned
cancel
caution
cross
danger
direction
empty
entrance
entry
error
forbid
forbidden
hazard
illegal
indication
isolated
legal
mistake
negative
prevent
prohibited
prohibition
protection
protest
red
reflection
refusal
rejection
remove
response
restricted
restriction
rights
road
safety
security
signal
stop
symbol
transport
transportation
warning
white
wrong
zone