access
accident
area
background
banner
barrier
black
boundary
caution
construction
cop
cordon
crime
criminal
cross
danger
design
disaster
enter
forbidden
horizontal
illustration
industrial
investigation
law
line
murder
not
order
perimeter
police
restricted
restriction
risk
safety
scene
security
sign
space
strip
symbol
tape
text
transparency
urban
violence
warning
yellow
zone
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