accident
asphalt
attention
background
barrier
caution
construction
danger
day
excavate
excavation
forbidden
ground
industrial
industry
line
maintenance
perimeter fence
prevention of accidents
protect
red
restraining
restrictive
ribbon
road
safe
safety
safety precautions
scene
security
sign
signal
signal ribbon
signal tape
site
soil
stick
stop
street
striped
symbol
tape
town
trench
urban
warning
wind
wiring
work
zone