accident
area
attention
background
banner
barricade
barrier
beware
black
border
caution
construction
cordon
cordoned
crime
criminal
crisscrossed
danger
design
detailed
emergency
forbidden
frame
grunge
industrial
industry
law
line
old
perimeter
police
prohibited
protection
restriction
ribbon
risk
safety
scene
security
stripe
striped
symbol
tape
texture
urban
vintage
wall
warning
yellow
zone