accident
barrier
beware
cliff
crane
crush
down
downfall
drop
fall
falter
figure
floor
footsteps
halt
hazard
head
icon
industrial
injury
label
moving
obstacle
obstacles
overhead
protection
reflect
risk
safety
safety first
security
set
sign
slide
sling
slip
slippery
staircase
stairs
step
sticker
stop
striking
stumble
surface
symbol
trip
walks
zone