機器
asphalt
backhoe
barrier
boundary
building
bulldozer
caterpillar
caution
cone
construct
construction
danger
enclosures
equipment
excavation
excavator
ground
highway
hydraulic
industry
iron
loader
machinery
metal
mining
mover
plastic
red
repaired
road
safety
scoop
security
sign
soil
stop
tractor
traffic
transportation
truck
vehicle
work