機器
barrier
building
building site
canal
caution
cement
city
closed
concrete
cone
cones
construction
construction site
detour
development
dig
digger
drain
drainage
dredger
equipment
excavation
excavator
hazard
industrial
industry
infrastructure
inspection
machinery
maintenance
pipe
pipes
red
repair
road
road building
roadworks
safety
sewage
sewer
sewer construction
shovel
stop
street
traffic
transportation
water
work
workers