機器
activity
ahead
aim
asphalt
background
barricade
block
broken
building
car
caution
closed
construction
copy
danger
day
engineering
equimpment
fuel
highway
industry
lamp
limit
low speed
markings
outdoors
reconstruction
red
repair
road
road work
roadworks
rush
safety
security
sign
space
street
summer
symbol
system
traffic
transport
transportation
travel
truck
urban
warning
works