機器
asphalt
attraction
backdrop
background
barricade
barrier
barriers
block
border
boundary
caution
cement
city
color
concrete
construction
control
danger
design
edge
equipment
excavator
heavy
highway
line
orange
pattern
plastic
protection
red
road
row
safety
security
sign
site
stop
street
stripe
symbol
traffic
transportation
up
used
vehicle
warning
work
yellow