alert
attention
background
barrier
border
boundary
build
button
caution
circle
cone
construct
construction
danger
detachable
equipment
gradient
graphic
gray
hard
hat
icon
illustration
industrial
industry
magenta
mark
paper
pictogram
plastic
pylon
road
safety
security
shadow
sign
signal
silhouette
street
striped
symbol
tool
traffic
transportation
violet
white
work
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