英文關鍵字
accident
alert
asphalt
attention
automobile
barrier
beware
car
caution
conduct
cone
construction
danger
divert
driver
emergency
forbidden
hazard
highway
icon
industrial
limit
manipulate
marker
motion
orange
palm
peril
pittfall
protection
public
pylon
red
repair
road
roadwork
safety
security
shift
shiny
sign
signal
slow
stop
street
stripe
thailand
traffic
trafficcones
transport
tree
trip
video
warning
work
works