accident
advice
advisory
alert
attention
background
beware
black
button
careful
caution
construction
danger
dangerous
design
error
exclamation
fatal
graphic
hazard
icon
illustration
industry
information
internet
isolated
mark
message
peril
point
precaution
protection
reflector
risk
road
safety
secure
security
sign
site
stop
street
symbol
traffic
triangle
warn
warning
web
yellow
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