access
accident
attention
background
banner
barricade
barrier
black
border
cartoon
caution
construction
cordon
crime
criminal
cross
danger
design
door
evidence
flat
graphic
illustration
isolated
line
modern
object
one
police
realism
realistic
restricted
ribbon
risk
road
safety
scene
security
sign
style
symbol
tape
text
urban
violence
warning
white
yellow