英文關鍵字
alert
asphalt
attention
background
barrier
black
building
caution
city
cone
construction
danger
digging
equipment
grunge
industrial
industry
inverness
limit
maintenance
metal
pavement
progress
reconstruction
red
repair
road
roadwork
roadworks
safety
sign
signal
site
stop
street
symbol
temporary
traffic
transport
transportation
triangle
under
urban
warning
white
work
worker
yellow