機器
barrier
build
building
bulldozer
city
closed
concrete
constructing
construction
danger
detour
development
dirt
earth
equipment
excavate
excavating
excavator
grading
gravel
heavy
highway
industrial
job
ladder
machinery
orange
pave
pavement
paving
pile
repair
residential
road
safety
sidewalk
sign
site
street
traffic
transportation
trench
vehicle
warning
work
workers