accident
alarm
backdrop
background
banner
barricade
barrier
border
careful
construction
constructor
crime
danger
dangerous
design
dirty
disaster
earthquake
frame
graphic
grunge
grungy
hazard
hazardous
illustration
limit
notice
old
policy
protection
risk
rust
rusty
safety
security
sign
striped
stripes
symbol
the attention
the caution
traffic
tsunami
urban
warning
wave
worn
yellow
zone