access
accident
area
attention
banner
barricade
barrier
black
border
caution
construction
cordon
crime
criminal
cross
danger
design
forbidden
hazard
illustration
industrial
isolated
line
perimeter
police
protection
restricted
ribbon
risk
road
safety
scene
seamless
security
set
sign
stop
strip
stripe
symbol
tape
urban
warning
white
work
yellow
zone