英文關鍵字
ahead
asphalt
attention
auto
building
car
caution
city
closure
cone
construction
danger
disruption
driving
equipment
highway
industry
law
line
maintenance
man
manhole
motorways
new
obstruction
pavement
paver
paving
precaution
regulation
repair
road
roadworks
roller
safety
sign
signal
site
street
symbol
traffic
transport
transportation
triangle
urban
warning
way
white
work
worker
working
yellow
zone