access
accident
attention
background
barricade
barrier
black
caution
construction
cordon
crime
criminal
cross
danger
evidence
forbidden
frame
grunge
illustration
industrial
justice
law
line
murder
object
orange
pattern
police
red
restricted
ribbon
risk
safety
scene
security
shiny
sign
stripe
symbol
tape
text
transparent
under
urban
violence
walk
warning
white
work
yellow
zone