access
accident
area
attention
background
banner
barricade
barrier
black
border
caution
construction
cordon
cordoned
crime
criminal
crisscrossed
danger
emergency
forbidden
illustration
industrial
law
line
perimeter
police
prohibited
protection
restricted
restriction
ribbon
risk
safety
scene
security
sign
strip
stripe
striped
symbol
tape
urban
warning
yellow
zone