access
accident
area
attention
background
banner
barricade
barrier
black
border
caution
construction
crime
criminal
cross
danger
design
evidence
forbidden
industrial
law
line
murder
no
perimeter
police
protection
restricted
restriction
ribbon
risk
safe
safety
scene
seamless
security
set
sign
stop
strip
stripe
stripes
symbol
tape
urban
violence
warning
work
yellow
zone