accident
alertness
attention
automatic
beware
blow
button
capsize
clip art
cold
compressed
crush
cylinder
dangerously
defeat
design element
electricity
error message
fall
field
gas
hand
hazard
hazard sign
high
hot
icon
injury
magnetic
narrow
safety
security
set
sign
slippery
stairs
start
symbol
temptation
triangle
trucks
violation
voltage
warning
wound