area
attention
banner
barricade
barrier
black
border
bright
caution
close
color
concept
cross
design
forbidden
horizontal
industrial
investigation
isolated
keep out
limits
line
no entry
nobody
not
off
order
prohibit
prohibited
protection
restricted
restriction
ribbon
safety
scene
seamless
security
sign
signal
site
stop
strip
stripe
tape
urban
warning
yellow
zone