機器
activity
asphalt
auto
automobile
barrier
broken
car
caution
city
cone
construction
damage
danger
dangerous
drive
driver
emergency
equipment
highway
industrial
industry
lane
maintenance
outdoors
pavement
problem
repair
repairing
road
roadside
roadwork
safety
service
sign
site
speed
street
symbol
traffic
transport
transportation
travel
truck
urban
vehicle
warning
work
yellow